Jose Mourinho says he did not know about agent Jorge Mendes' vote of confidence before it was released.
Mendes made a rare public statement on Friday when he insisted Manchester United were fully behind Mourinho despite a disappointing start to the season.
"I have nothing to do with the statement, it is Jorge's statement, not my statement," Mourinho told a news conference ahead of the Champions League clash with Valencia.
"I didn't know [it was coming] and I don't care about it."
Mourinho has already confirmed Paul Pogba, left in the bench against Arsenal and Fulham, will start against the Spanish side while 17-year-old midfielder James Garner is set to be on the bench.
Mourinho will rotate his squad with United already through to the last 16.
"I am looking for him [Pogba] to play well, and for him to have a good impact on the game and the team," said Mourinho.
"I hope that people like Paul and a couple of others that are normally in the team, I hope they can have a good impact on the team."
United can still finish top of Group H if they win in Spain and Juventus fail to beat Young Boys.
Mourinho is still expected to name a makeshift team but the 55-year-old insists it is not because he has one eye on the Premier League clash with Liverpool on Sunday.
"It's not about Liverpool, it's about the match [against Valencia]," he said. "Football is football, anything can happen.
"Normally Juventus should win in Switzerland, so I don't think the result of the match will have an impact."