Liverpool completed their best start to a season for 28 years by extending their Premier League winning run to five games, but manager Jurgen Klopp is sweating on an eye injury suffered by goalscorer Roberto Firmino.

Firmino added a second goal to Georginio Wijnaldum’s opener against Tottenham Hotspur, but was then forced off following a clash with Jan Vertonghen and went straight to Moorfields Eye Hospital in London with Liverpool doctor Andy Massey for checks.

Liverpool later confirmed the Brazilian had suffered an abrasion to the eye, and although there is no lasting damage he is considered a big doubt for Tuesday’s game with Paris St-Germain although the club said he “has not yet been ruled out”.

Firmino’s injury was the only dark spot on a fine day for Liverpool, who fully deserved their fifth successive victory despite Erik Lamela pulling a late goal back and Tottenham claiming they should have been awarded a penalty in injury-time when Sadio Mane appeared to catch Heung-min Song.