The 37-year-old arrived at United’s Carrington training ground with his agent Jorge Mendes on Tuesday morning ahead of talks over his future.
Former United manager Sir Alex Ferguson was also seen arriving but it is understood he is there for a regular board meeting with chief executive Richard Arnold.
Ronaldo flew back to the UK on Monday after missing the club’s pre-season tour of Thailand and Australia due to family reasons, with the explanation accepted by the club.
The club’s stance regarding Ronaldo’s future has remained unchanged: United are willing to listen to offers for Ronaldo this summer, Sky Sports News understands, but the club’s public stance remains that he is not for sale.
Ten Hag said in Bangkok that Ronaldo, who has one year remaining on his United contract, is in his plans for the season ahead and expects him to stay at the club.