The defender posted a picture of the gash with three stitches in on Twitter on Sunday morning. The former Manchester United defender made his Hammers debut on Saturday afternoon.
West Ham fans paid tribute to club icon and former England captain Bobby Moore on the 25th anniversary of his death ahead of their Premier League match against Liverpool at Anfield.
Mohamed Salah equalled Luis Suarez' goal haul from 2013-14 en route to a thumping Liverpool victory against West Ham and there were also victories for Huddersfield and Brighton.
Watch goals and highlights from Saturday's Premier League matches, as Liverpool, Brighton, Huddersfield and Watford secured wins.
In 2011, Evra was involved in a row with Luis Suarez which resulted in an eight-match ban and £40,000 fine for the then-Liverpool striker after he was found guilty of racially abusing his opponent.
The dissatisfaction of some Hammer fans over the way the club is being run was evident during a 4-1 defeat to Liverpool at Anfield
The Reds romped to a dominant Premier League win over the Hammers moving to second in the table and leaving their manager delighted
Liverpool maintained their unbeaten record at Anfield in the Premier League this season and moved up to second with a 4-1 win over West Ham.
The 26-year-old forward latched on to a through ball in the second half before cleverly flicking past the out-rushing Adrian to leave himself with the simplest of tasks to tap in.
The winger became the most prolific left-footed scorer in the league's history and contributed another goal as the Reds hit the century mark