It seems Sancho doesn't want to move to AS Roma because I heard that AS Roma and Manchester United have agreed on a transfer fee for Sancho, but Sancho hasn't shown any positive sign of joining AS Roma this summer. In my opinion, Sancho wants to stay at Manchester United and see off his big money contract because I don't understand why a player who wants to leave Manchester United would reject a move to Chelsea because of a reason best known to him.
I think there is more to this Jodan Sancho's matter than we know because it's difficult to understand why he has refused to accept the offer from AS Roman since he is not longer wanted in the team, Sancho is a good player no doubt and he is receiving money in Manchester United but he can't continue to be there doing nothing when he has the opportunity to move to another team to prove himself and he could have an opportunity of getting a better offer from another better club.
I guess his big salary is keeping him in the team so mwy be he wants to remain in Manchester United till he's contract is over with the team.