He has been a key figure for Ferguson's side in the absence of regular right-back Gary Neville and Newcastle made an attempt to sign him during the January transfer window.
The United manager added: "I am delighted Wes has signed a new contract.
"He has grown up at this club and is an integral part of the squad.
"He has done a great job during Gary's absence and has been a major factor in our outstanding defensive performance."
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