"For him, one against one with the goalkeeper, he is a good goalscorer", Wenger said after the game. "It is envisaged that he will return to the squad within four to six weeks", read an Arsenal statement.
The Frenchman reflected back at Arsenal's poor season so far saying, "We have to win the next game".
Lacazette will also be absent for the league meeting against Manchester City at the Emirates, which takes place a week after the two sides meet in the Carabao Cup final at Wembley. In their last five they were able to win three, draw once and lose once, which saw them onto 13 points.
Arsene Wenger has hinted that he will play a full-strength team in Arsenal's Europa League clash against Ostersunds FK on Thursday (via The Mirror). "He will always think that some of the players are not worth the price that you put on a table".More news: Haiti's president Jovenel Moise hits out at Oxfam abuse scandal
Arsenal have been useless away from home this season and and not even new signings Henrikh Mkhitaryan or Pierre Emerick-Aubameyang could prevent Spurs from painting North London white.
In their first experience of European competition, they have dispatched Galatasaray and Hertha Berlin (and secured a notable 2-2 with Athletic Bilbao), becoming the first Swedish club to reach the competition's knockout stages.
The focus will nearly certainly be on the Europa League, knowing that a win provides both a trophy and Champions League football, but it's going to be a delicate balancing act for a manager in whom there is ever-diminishing faith.