He declared: "It means the world to me — a roller coaster of emotions from sadness to ecstasy.
“Sadness because I have won everything as a player here and will miss these moments. Sadness too because we have suffered heavy defeats as a team.
“But thanks to the support of the fans we have managed to lift ourselves and I have no doubt they will savour more success in the near future as they deserve. They have always supported me even in my darkest days with serious injuries.
“My message to all Manchester United fans on behalf of myself and my family is to thank you for giving me your undivided support. I wish them all the best for the future and that future teams provide you with great victories on the field.
“My wife and daughter and closest friends will join me in my final game. I hope they enjoy and savour the occasion as much as I do as their commitment and support during the past 10 years was crucial to my success.
“I am just concentrated in the Copa America with my nation, after tomorrow's final game at Old Trafford.
“After this I will sit down with my family and advisors and give the matter thought as I'd like to play for a further two, three years.
“My first piece of silverware with United, Carling Cup 2010, as I had reached the pinnacle of my dreams as a young kid in Ecuador. For a whole month my family and friends kept calling me elated with emotion as they had seen my childhood dreams come true."