The Republic of Ireland international keeper has lost the number one jersey at City to England keeper Joe Hart this season and is to speak with manager Roberto Mancini about the possibility of going out on loan to command regular first team football.
"It's very, very frustrating. I know it doesn't matter what I do on the training pitch, I won't be playing at the weekend," he has told the Sunday Times.
"If I'm flying around like Clark Kent in goals, I still won't play on Saturday. That can be demoralising.
"I've never said I want to leave Man City. I believe it's a big club that in the next couple of years is going to do big things. I want to be part of that but I also want to be playing football.
"I wouldn't mind where a loan was and wouldn't rule out abroad if it was a good club and a good team, no disrespect to a club that's fighting relegation and getting pummelled every week - though at the minute that probably seems better than what I'm doing."