Tottenham Hotspur say they will investigate a banner allegedly carried by some of the club's supporters that referred to Chelsea wing-back Marcos Alonso's involvement in a car crash that resulted in the death of a woman six years ago.

Spurs condemned the banner -- displayed on social media, apparently outside Huddersfield Town's stadium on Saturday -- as "extremely poor taste" and said the perpetrator, or perpetrators, would face action "if found to be a Spurs fan."

Alonso's name was written at the top of the banner with an image of a car, an international prohibition sign for no drinking and a message reading: "He murdered a girl."

In May 2011, Alonso -- then a Bolton player -- was arrested and charged with offences including being over the legal alcohol limit and speeding after a 19-year-old woman, one of four passengers, died following a car crash in Madrid.

Marcos Alonso joined Chelsea from Fiorentina in 2016. Catherine Ivill - AMA/Getty Images

The Chelsea player, now 26, initially faced up to four years in prison but, in February 2016, he was fined €61,000 and banned from driving for three years and four months.

According to the Times, Huddersfield did not confiscate the banner and there was no sign of it inside the John Smith's Stadium for Spurs' 4-0 win in the Premier League.

"This banner is clearly in extremely poor taste and we are investigating the matter," a Tottenham spokesman said. "If found to be a Spurs fan, they will be dealt with accordingly."

An image of the banner was posted on social media, before being hastily removed following intense criticism, but it has since been reposted elsewhere.

Alonso scored twice against Spurs in Chelsea's 2-1 win at Wembley on the opening day of the Premier League season.