Sunderland go to Old Trafford this week for the second-leg of their Capital One Cup semifinal.
When asked about the transfer speculation, Mannone said: "I don't really care about this stuff.
"It's stuff that happens outside of the football pitch. My concentration is on the football pitch and it was on this game.
"Now we have got another massive game. I am really living my best time right now at Sunderland and I don't see why I would move right now.
"I want to stay as first choice and I want my performances to improve. That's the only aim I have, apart from aiming to beat Manchester United.
"That's the only focus I have on Manchester United."
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