Wow. Osimhen is playing his own game. First when he caught the eye at Napoli he didn't want to leave too soon, then he didn't want to stay, then he went on loan and now he wants to go to United whose only chance of getting into the Champions League is to win the Europa League. He would be a major boost for the club and as a United fan I welcome it but I can't see why he would take such a risk personally.
He's probably has no choice considering he lacks of interest from the big clubs due to the so many drama he made in the past. The longer he plays mind game like this, the bad for him.
If he's really interested to leave, he could do that by telling his club's destination to buy his release clause. I'm also feeling good enough if i can see him wear Manchester United's shirt. Hopefully, he goes there with all of his sense.
I know it may be doubting you, but who knows he's already finished his playing game. He maybe wanna playing serious games.