The Daily Mail reports that the new deal will see the 21-year-old striker earn £75,000-a-week at Old Trafford.
The youngster made 30 appearances and scored nine goals for United in the Premier League last season.
Welbeck also featured for England at Euro 2012 this summer.
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As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?
Being an amiable guy is good for you and Jurgen Klopp is living proof.