Arsenal have not been able to identify the supporter accused of antisemitic “hissing” and chants about “gassing Jews” during last December’s north London derby, and believe the fan in question has not returned to the Emirates since the incident.

The club are continuing to monitor the season-ticketed seats from which the alleged incidents emanated. However, the original complainant – another supporter seated in the North Bank stand who alerted stewards during the match – did not want to take the case further.

Tottenham Hotspur have a large Jewish fanbase and the club has called for an urgent clampdown on antisemitism. Arsenal opened an investigation – as revealed by The Independent at the time – following the acrimonious Carabao Cup tie which also saw Spurs midfielder Dele Alli hit by a bottle thrown from the stands.

The man accused of antisemitic behaviour was involved in an altercation at the stadium before leaving the ground of his own accord. A group of seats at the Emirates were identified by Arsenal and continue to be surveyed closely, but the club believe he has stayed away.

Arsenal opened a fresh investigation last week into alleged racist abuse aimed at Napoli’s Kalidou Koulibaly during the first leg of their Europa League quarter-final, while Chelsea stopped fans from entering the stadium for their game against Slavia Prague after video emerged of Islamophobic chants about Liverpool’s Mohamed Salah.

Arsenal vs Napoli: Player ratings Show all 22 1 /22 Arsenal vs Napoli: Player ratings Arsenal vs Napoli: Player ratings Petr Cech - 7 LONDON, ENGLAND - APRIL 11: Goalkeeper, Petr Cech of Arsenal makes a save during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Catherine Ivill/Getty Images) Catherine Ivill Getty Images Arsenal vs Napoli: Player ratings Ainsley Maitland-Niles - 7 LONDON, ENGLAND - APRIL 11: Napoli's Piotr Zielinski and Arsenal's Ainsley Maitland-Niles during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Rob Newell - CameraSport via Getty Images) Rob Newell - CameraSport CameraSport via Getty Images Arsenal vs Napoli: Player ratings Sokratis - 6 LONDON, ENGLAND - APRIL 11: Sokratis Papastathopoulos of FC Arsenal and Lorenzo Insigne of SSC Napoli battle for the ball during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by TF-Images/Getty Images) TF-Images Getty Images Arsenal vs Napoli: Player ratings Laurent Koscielny - 6 Arsenal's French defender Laurent Koscielny (L) vies with Napoli's Italian striker Lorenzo Insigne during the UEFA Europa League quarter final, first leg, football match between Arsenal and Napoli at the Emirates Stadium in London on April 11, 2019. (Photo by Ben STANSALL / AFP)BEN STANSALL/AFP/Getty Images BEN STANSALL AFP/Getty Images Arsenal vs Napoli: Player ratings Nacho Monreal - 6 LONDON, ENGLAND - APRIL 11: Nacho Monreal of Arsenal battles for the ball with Dries Mertens of Napoli during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Catherine Ivill/Getty Images) Catherine Ivill Getty Images Arsenal vs Napoli: Player ratings Sead Kolasinac - 6 Arsenal's Sead Kolasinac, top, tackles Napoli's Elseid Hysaj during the Europa League first leg quarterfinal soccer match between Arsenal and Napoli at Emirates stadium in London, Thursday, April 11, 2019. (AP Photo/Kirsty Wigglesworth) Kirsty Wigglesworth AP Arsenal vs Napoli: Player ratings Lucas Torreira - 8 epa07500052 Arsenal's Lucas Torreira celebrates after scoring the 2-0 lead during the UEFA Europa League quarter final, first leg soccer match between Arsenal FC and SSC Napoli in London, Britain, 11 April 2019. EPA/NEIL HALL NEIL HALL EPA Arsenal vs Napoli: Player ratings Aaron Ramsey - 8 Arsenal's Welsh midfielder Aaron Ramsey celebrates scoring the team's first goal during the UEFA Europa League quarter final, first leg, football match between Arsenal and Napoli at the Emirates Stadium in London on April 11, 2019. (Photo by Ben STANSALL / AFP)BEN STANSALL/AFP/Getty Images BEN STANSALL AFP/Getty Images Arsenal vs Napoli: Player ratings Mesut Ozil - 6 LONDON, ENGLAND - APRIL 11: Mesut Ozil of FC Arsenal looks on during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by TF-Images/Getty Images) TF-Images Getty Images Arsenal vs Napoli: Player ratings Alexandre Lacazette - 6 Arsenal's French striker Alexandre Lacazette (L) vies with Napoli's Albanian defender Elseid Hysaj during the UEFA Europa League quarter final, first leg, football match between Arsenal and Napoli at the Emirates Stadium in London on April 11, 2019. (Photo by Ian KINGTON / IKIMAGES / AFP)IAN KINGTON/AFP/Getty Images IAN KINGTON AFP/Getty Images Arsenal vs Napoli: Player ratings Pierre-Emerick Aubameyang - 7 11th April 2019, Emirates Stadium, London, England; UEFA Europa League football, quarter final, 1st leg, Arsenal versus Napoli; Pierre-Emerick Aubameyang of Arsenal giving the thumbs up to fans calling his name (photo by John Patrick Fletcher/Action Plus via Getty Images) John Patrick Fletcher Action Plus via Getty Images Arsenal vs Napoli: Player ratings Alex Meret - 6 LONDON, ENGLAND - APRIL 11: Alex Meret of Napoli in action during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Matthew Ashton - AMA/Getty Images) Matthew Ashton - AMA Getty Images Arsenal vs Napoli: Player ratings Mario Rui - 6 LONDON, ENGLAND - APRIL 11: Mario Rui of Napoli tackles Mesut Ozil of Arsenal during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Justin Setterfield/Getty Images) Justin Setterfield Getty Images Arsenal vs Napoli: Player ratings Kalidou Koulibaly - 6 Napoli's French-born Senegalise defender Kalidou Koulibaly (L) vies with Arsenal's German midfielder Mesut Ozil during the UEFA Europa League quarter final, first leg, football match between Arsenal and Napoli at the Emirates Stadium in London on April 11, 2019. (Photo by Ben STANSALL / AFP)BEN STANSALL/AFP/Getty Images BEN STANSALL Getty Arsenal vs Napoli: Player ratings Nikola Maksimovic - 6 11th April 2019, Emirates Stadium, London, England; UEFA Europa League football, quarter final, 1st leg, Arsenal versus Napoli; Nikola Maksimovic of Napoli holds off the challenge from Pierre-Emerick Aubameyang of Arsenal (photo by John Patrick Fletcher/Action Plus via Getty Images) John Patrick Fletcher Action Plus via Getty Images Arsenal vs Napoli: Player ratings Elseid Hysaj - 5 Soccer Football - Europa League Quarter Final First Leg - Arsenal v Napoli - Emirates Stadium, London, Britain - April 11, 2019 Napoli's Elseid Hysaj in action with Arsenal's Alex Iwobi Action Images via Reuters/Matthew Childs MATTHEW CHILDS Action Images via Reuters Arsenal vs Napoli: Player ratings Jose Callejon - 5 LONDON, ENGLAND - APRIL 11: Jose Callejon during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by SSC NAPOLI/SSC NAPOLI via Getty Images) SSC NAPOLI SSC NAPOLI via Getty Images Arsenal vs Napoli: Player ratings Allan - 6 LONDON, ENGLAND - APRIL 11: Mesut Ozil of Arsenal battles for the ball with Allan of Napoli during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Justin Setterfield/Getty Images) Justin Setterfield Getty Images Arsenal vs Napoli: Player ratings Fabian Ruiz - 5 LONDON, ENGLAND - APRIL 11: Lucas Torreira of Arsenal battles for the ball with Fabian Ruiz of Napoli during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Catherine Ivill/Getty Images) Catherine Ivill Getty Images Arsenal vs Napoli: Player ratings Piotr Zielinski - 5 Soccer Football - Europa League Quarter Final First Leg - Arsenal v Napoli - Emirates Stadium, London, Britain - April 11, 2019 Napoli's Piotr Zielinski in action with Arsenal's Petr Cech REUTERS/Eddie Keogh EDDIE KEOGH REUTERS Arsenal vs Napoli: Player ratings Lorenzo Insigne - 6 LONDON, ENGLAND - APRIL 11: Lorenzo Insigne of S.S.C. Napoli during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by SSC NAPOLI/SSC NAPOLI via Getty Images) SSC NAPOLI SSC NAPOLI via Getty Images Arsenal vs Napoli: Player ratings Dries Mertens - 6 LONDON, ENGLAND - APRIL 11: Dries Mertens of Napoli during the UEFA Europa League Quarter Final First Leg match between Arsenal and S.S.C. Napoli at Emirates Stadium on April 11, 2019 in London, England. (Photo by Marc Atkins/Getty Images) Marc Atkins Getty Images

Asked about the story from Chelsea, Arsenal forward Pierre Emerick-Aubameyang said: “I am really disappointed about that. I had the same problem here against Tottenham. When you are black like me it is really painful, I think, because we are in 2019 and obviously it is not good for football in England. Hopefully we will find a way to kick it out.”