Manchester United say they are taking "appropriate steps" after Cristiano Ronaldo's interview in which he said he was "betrayed by the club".
The Portuguese forward said he had "no respect" for manager Erik ten Hag and is being forced out of Old Trafford.
The club will not comment further until "this process reaches its conclusion".
After a wide-ranging interview with Piers Morgan for Talk TV, the future of 37-year-old Ronaldo at Man Utd is in doubt.
Ronaldo will captain Portugal at the World Cup in Qatar, with their opening Group H game against Ghana on Thursday.
He has not played because of an unspecified illness since he captained United in their 3-1 defeat at Aston Villa on 6 November.
Ronaldo was dropped for the Premier League game at Chelsea last month by Ten Hag after refusing to come on as a substitute against Tottenham three days earlier.
The Red Devils, who beat Fulham 2-1 on Sunday, are fifth in the Premier League in Ten Hag's first season as manager.
