We can say that Mason Mount is a promising player because he is 24 years old. Chelsea will want to keep him first, as he is one of the players who benefit Chelsea. If he cannot keep it in the team, they will not approve his transfer before the transfer fee they will earn from him is high. If Manchester United makes this transfer, the burden on Rashford may be lessened.
Marcus Rashford is under a lot of attacking pressure because the supporters expect him to be at his best in every game he participates. Manchester United is upbeat about the agreement, but they are unwilling to match the price tag on their Chelsea priority signing. He's 24 years old and has a long way to go; I occasionally see him performing at higher levels in the club. Mason Mount has always wanted to leave the club; he is no longer interested in the blues' extended deal, despite Chelsea's refusal to move him for a probable exit, which will see him as a free agent; guess who loses, Chelsea.