Arsene Wenger has claimed that Raheem Sterling "dives well" after the Manchester City forward won a penalty for his side in their 3-1 win over Arsenal on Sunday.
Kevin De Bruyne put City ahead in the 19th minute before Sergio Aguero doubled the lead from the penalty spot after Nacho Monreal was adjudged to have bundled over Sterling.
Although substitute Alexandre Lacazette halved the deficit the 65th minute, the hosts scored a third through Gabriel Jesus, who was in an offside position.
"I believe it was no penalty," Wenger told reporters after the game. "We know that Raheem Sterling dives well, he does that very well. And the third goal was offside. I am very upset because at 2-1 we were in the game.
"The third goal was the killer and it is by coincidence that mistakes always go for the home team, as we know.
"It is unfortunate that the game finished the way it finished. I am disappointed. You can accept if it City win in a normal way, they are a good side but this is unacceptable. Last season we lost two offside goals and it has happened again."
The loss leaves Arsenal 12 points behind Premier League leaders City in the table.
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