Manchester United interim manager, Ralf Rangnick, who will take up a consultancy at Old Trafford in the summer, is also an admirer of the player and knows the Chelsea defender’s brother – who is also his agent – well.
Rudiger’s contract at Stamford Bridge expires at the end of the season, but he is now free to negotiate a deal with clubs abroad ahead of a free transfer in the summer.
Chelsea are still hopeful of extending Rudiger’s contract and could still remain in West London.
However, the Blues’ most recent offer – made at the start of the season – was dismissed by Rudiger and his representatives as it promised to pay him only half of what the club’s top earners make.
Despite the uncertainty over his future, Rudiger is understood to remain committed to Chelsea for the remainder of his contract and focused on helping Thomas Tuchel’s side achieve their objectives.