Lacazette has slammed the Gunners for their poor mentality.
"They were not very dangerous but this match summarises how we are this season. We are winning the match but don't get it over the line," Lacazette told RMC Sport.
"We are quite naive at the moment. We need to be nastier and more consistent in the 90th to 93rd minutes of matches.
"Especially when we can do better than this. We have the players required. It is a shame."