Manchester United want to see a change in Cristiano Ronaldo's attitude or they will consider terminating the legendary forward's contract, as per Sky Sports.
The Portuguese star's future has been the talking point of the summer despite new manager Erik ten Hag's arrival at Old Trafford.
Ronaldo wants to continue playing in the UEFA Champions League and has reportedly asked the club to listen to any offers made for his services.
However, interest in the five-time Ballon d'Or winner has been scarce likely due to his age and the financial implications involved in a potential deal.
The 37-year-old cut a frustrated figure throughout Manchester United’s woeful 4-0 thrashing at the hands of Brentford on August 13.
The Red Devils striker even decided not to acknowledge the club's traveling fans in the stands and instead headed for the tunnel in fury.
Sky Sports claim that his attitude has led United to consider taking action and they may even terminate his contract if it does not improve.
The legendary forward has a year left on his current deal at Old Trafford, having rejoined the side from Juventus last summer for £13.5 million. There's an option for an additional year as well.
He scored 24 goals in 38 appearances last season, playing in a Manchester United side that could only manage a sixth-placed finish in the Premier League.
A sixth-placed finish means Cristiano is staring at a season of not playing in the Champions League and instead competing in the Europa League.
Manchester United and Cristiano Ronaldo's relationship is becoming fractious
Ever since reports emerged that Ronaldo wanted to leave the Red Devils, speculation has been rife over the centre-forward's state of mind.
United's stance throughout the saga has been that the player is not for sale, but Ronaldo's own opinion on the matter hasn't been made clear.
Prior to the 4-0 defeat to Brentford, Old Trafford boss Ten Hag was asked about the his forward's situation.
He responded intriguingly:
"That is your assumption. That is not what he is telling me. So I deal with the players we have and we plan with him for this season and we are happy with him and we have to fit him into the team. So he has to come at the right fitness levels so that he can do the job that we expect him to do."
The news that the club are starting to take issue with the former Real Madrid star's attitude speaks volumes of the unrest on the part of the player.