Valencia has made a big impact since arriving at Old Trafford from Wigan in the summer of 2009, playing a key role last term both in United’s record 19th league title win and the club’s run to a third Champions League final in four seasons.
Upon signing his new deal, Valencia told the club’s official website: “I am delighted to stay at United.
“Since my first day at Carrington, I have been happy here. I hope that I can continue to develop as a player.
“I am looking forward to making my contribution to helping this squad compete for more trophies.”
Manager Sir Alex Ferguson praised the winger after signing his new deal, hailing his versatility and strength of character following his injury last season.
The Scot said: “Antonio has made a fantastic contribution since his arrival. His speed, crossing ability and versatility have been a big asset for us.
“He has a quiet, unassuming way of going about his business, which is underlined by great strength of character – as his recovery from such a bad injury last season proves.”
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Official: Antonio Valencia signs new four-year contract with Manchester United