Sancho has developed into one of the most exciting young talents in world football since joining Dortmund from Manchester City in 2017 having failed to make the breakthrough under Pep Guardiola at the Etihad Stadium.
Reports claim Sancho will be handed the famous No.7 whether or not the Red Devils qualify for next season's Champions League.
"It is our understanding that Sancho has agreed in principle in the last two weeks a five-year contract with Manchester United which will pay him initially £140,000 per week but increasing to around £200,000 per week over the course of that deal".
Some Manchester United fans may have become anxious that Mason Greenwood's emergence could mean the club won't invest in Jadon Sancho any longer.
McGarry said: "The player's agent has recently been busy doing other deals, notably with Saka's new deal with Arsenal but is still hopeful that United will be able to agree a fee with Borussia Dortmund".
Sancho, 20, has been a long-term target for Ole Gunnar Solskjaer's United with the Reds in desperate need of a right-sided attacker to add to their already flourishing attacking line. Reports from England claim that United have offered €55m for Sancho, including a series of bonuses.
Messi will finish career at Barcelona, says club president
It is believed the 33-year-old is frustrated at the Nou Camp and could take advantage of a clause in his contract to leave. Barca's front three of Messi , Suarez and Griezmann clicked perfectly in one of their best performances in recent months.