Jose Mourinho has promised to fight with other coaches to sign Gareth Bale if Real Madrid are willing to sell.
The Welsh man has reportedly unhappy at the Bernabeu with United closely monitoring his situation at the club.
Manchester United battle Real Madrid in the UEFA Super Cup on Tuesday and has been linked with a £90m bid for Bale.
Bale, 28, joined the Spanish giants for a world record fee of £85m from Premier League side Tottenham in 2013.
“If he plays, it is the clearest signal that he is staying there,” said the former Real manager.
Mourinho said of Bale who is likely to feature in the game tomorrow: “If he plays, it is the clearest signal that he is staying there, he is in the plans of the coach and the club, and it is in his own plans and ambitions to stay there.
“Then I won’t even think about it. If he is not in the club’s plans and it is true that a player like Bale is at the departure gate, I will try to be there waiting for him at the other side.”
Bale committed his future to Madrid at the end of last season, saying he was happy to stay with the 12-time European champions.
Last October, he signed a new deal to stay at the Bernabeu until 2022.