Portuguese agent Paulo Barbosa is convinced Cristiano Ronaldo could yet leave Manchester United before the market shuts this month.
Ronaldo was a second-half substitute for Sunday's defeat to Brighton.
Barbosa told Sport-Express: "Everyone knows that Ronaldo is unhappy with the fact that he remains at Manchester United for the time being. He kind of shows his displeasure.
"No, it's not helpful. Ronaldo does not play alone. The team has rules, every player must respect the decision of the coach. He continues the conflict he created.
"In the previous match, he left during the break, today he showed his displeasure again.
"He tests the patience of the team's leadership. I think he wants to force the termination of the contract with the club. How will this situation end? A question for Manchester United's patience. Ronaldo's behavior discredits him. It's not the best way."