Manchester United are in the dark over Cristiano Ronaldo's plans to return for preseason training, with his participation in the summer tour of Thailand and Australia uncertain, sources told ESPN.

Ronaldo, who has asked to leave Old Trafford, was due to begin training with the rest of United's international players at Carrington on Monday but was given permission by the club to take an extended break because of "family reasons."

The squad are due to fly to Bangkok at 4.30 p.m. BST (11.30 a.m ET) on Friday but sources have told ESPN that manager Erik ten Hag does not yet know whether Ronaldo plans to train in Manchester this week or make himself available for the tour.

United's first friendly is against Liverpool in Bangkok on July 12.

Sources have told ESPN that Ronaldo has informed United bosses that he would like to move during the transfer window amid interest from Chelsea, Bayern Munich and Napoli.