Arsenal manager Arsene Wenger was furious after his side's 3-1 away defeat at Manchester City.
The Frenchman believes referee Michael Oliver made a number of mistakes as he awarded a penalty to the hosts at the start of the second half.
They also scored after David Silva appeared to be in an offside position as he assisted Jesus for the hosts' third.
The Gunners are now 12 points off the top of the English Premier League table.
"The referees don't work enough," Wenger told the BBC.
"The level drops every season. The decisions are just wrong.
"I believe it was no penalty. We know that Sterling dives well he does that very well. And the third was offside.
"You have seen what I've seen.
"The fact that you tell me it's an offside goal shows enough. I don't want to take anything away from their quality but it happened at a moment when we were in the game."
