The England striker, out of Wednesday’s clash with Italy through injury, will end protracted talks about his new deal.
Welbeck had been reluctant to sign another long-term contract until his salary reflected his growing status as Wayne Rooney’s regular strike partner at United.
He made 30 appearances in the Barclays Premier League last season after forcing his way ahead of his rival forwards at Old Trafford— Dimitar Berbatov, Javier Hernandez and the departed Michael Owen.
He scored nine league goals for United before he was taken to Euro 2012 by new England chief Roy Hodgson. This season, Ferguson has set a minimum target of 20 goals for Welbeck, who now has nine England caps.
His new contract, to be signed imminently, is packed with incentives based on future performance.