Former Lyon striker Lacazette opened the scoring at the Emirates inside three minutes but was replaced by Olivier Giroud at half-time.
Wenger revealed after the match the 26-year-old sustained an injury that will rule him out of Saturday’s highly anticipated clash with second-placed Manchester United and potentially longer.
“It is an injury. It looked like a groin injury and he is definitely out of the weekend. He might be out for a while,” said the Arsenal boss.
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