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.
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?