City were comfortable 3-0 winners on Sunday.
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“I am feeling bad," he said to MUTV.
"Disappointed in myself, in the team, and disappointed for the fans that we couldn’t bring the performance we did lately today.
"If you lose and you play good and you have the chances we created in previous games, you can take some positives.
"But today was just not good enough.
"It is hard to say (where specifically it went wrong) because you are always full of emotion after the game, so I always try to calm down and try to analyse the game.
"Otherwise, I will just point fingers and often it is not something I point out now.
"We will analyse it as a team and improve."