So far there is no news regarding contract extension being offered yet but He had shown intention of moving to another club when being offered a new contract last season. That was before Ronaldo joined the team so things could probably change or depending on how it goes before January. Higher chance for him to stay if United keeps on winning
Another contract extension might be offered around December so if he doesnt want to sign it then I dont think United will let him leave in January because the club still needs him in the field. I dont think anyone will be able to replace him if they want to win the league or UCL