Cristiano Ronaldo missed training with Manchester United on Monday due to "family reasons", just days after the Portugal star reportedly told the club he wants to leave.
United players who had been away on international duty over the close-season were scheduled to meet up with the rest of the squad on Monday.
However, the 37-year-old's absence will be interpreted as the latest salvo in his bid to engineer a move away from Old Trafford. Ronaldo is said to be disappointed by United's decline since he returned to the club from Juventus last year.
United failed to qualify for this coming season's Champions League after finishing sixth in the Premier League.
Despite the arrival of new manager Erik ten Hag from Ajax, Ronaldo reportedly does not believe United can challenge for major honours in the near future.
In the twilight of his career, Ronaldo would prefer to join a club capable of satisfying his desire to compete for the game's top prizes.
Ronaldo's absence from training comes as United are due to leave for their pre-season tour of Asia and Australia on Friday.