Manchester City boss Roberto Mancini accepts decisions have gone against his team in recent weeks because referees are tired and lose concentration.
"The refs sometimes are tired - to play every two or three days is difficult for the players, and for the referee.
"The referee is like me, like the players. They can be tired sometimes."
Mancini, however, does not think his team are the victims of any conspiracy, only bad luck.
He said: "Yes, yes - in December and January, it is only this way." "I think playing a lot of games is also difficult for them [referees].
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