The Reds face City just 48 hours after losing to Europa League opponents Besiktas in Turkey.
"I think of course it's an advantage," he said. "I also played in the Europa League and when you arrive back on Friday it is not the best way to prepare.
"You cannot prepare the game because you finish on Thursday night and you must play on Sunday, the players need at least 48 hours to recover.
"But that is the rules. They are playing Europa League. Maybe another time it will be us who have a worse preparation for the game."