De Gea's future at United has been the subject of conjecture in recent weeks with reports in Spain linking him with a possible move back to Spain with Real Madrid and Barcelona.
The 22-year-old has come in for criticism this season for some performances this season with his critics suggesting he has struggled to adapt to the rigours of English football since his arrival from Atletico Madrid in the summer of 2011.
De Gea silenced his critics with a man-of-the-match performance in Wednesday's UEFA Champions League clash with Real Madrid and he insists he is happy with life at United.
"I am very happy in Manchester. Every day I am happier," De Gea told reporters after the game.
De Gea produced an unorthodox save to keep out Fabio Coentrao saving his effort with a scissor-kick clearance on his line and the keeper admits the stop was instinctive.
"Stopping to Coentrao? That was just a very quick decision. I was acting on instinct.
"It was a great match. Real Madrid and Manchester United did very well. [Madrid] have a very strong attack, so we needed to be strong in defence.
De Gea is expecting another busy encounter in the second leg with Real needing to score to cancel out United's away goal in the Bernabeu.
"Real Madrid will attack at Old Trafford. They know they have to win to advance and we will do our best to stop them," concluded De Gea.