Mason Mount ended his 18-year spell with boyhood club Chelsea.
The England international has penned a five-year deal with Man United and has been the subject of speculation for several months now.
He was not willing to extend his contract with the Blues and to work with new manager Mauricio Pochettino who was also keen to keep hold of the midfielder.
The Blues have offloaded several players to balance their books and for most part these players were considered surplus to the manager’s requirements.
But Mount has been Chelsea’s best player winning the Player of the Year award in 2021 and 2022.
Rio Ferdinand believes Chelsea will regret selling Mount to Manchester United.
‘Really pleased with Mount coming in,’ he posted on Twitter as he reacted to the news.
‘Young, talented & hungry. He has the experience of big games with pressure which comes when playing for Utd.
‘As a player he will bring us goals, creativity, a work ethic & a willing runner into the opposition box. He definitely adds to what we have in the squad and is different from the others in midfield.
‘I actually think in time Chelsea will regret selling Mount. Now for a No.9….’