I don't see any chance of Manchester United finishing in the top 6 of the Premier League and their chance of winning the EL is also very slim, because ManU simply play very bad football and there are still teams like Bilbao, Tottenham and Frankfurt in the tournament. Whereby Tottenham is playing just as badly as ManU this season but I still see little chance of them getting into european competitions next year and then Osimhen can only play in the PL and the FA Cup, does he really want that?
There is no choice for Osimhen unless another team much better than Manchester United is willing to sign him.
Compared to staying in Turkey, it is much better to take the opportunity at Manchester United so that if next season he can make a much more effective contribution then Manchester United can compete for the title again and that will make his name even bigger.
That is something that is difficult for Manchester United to achieve because in the remaining games they face some strong teams so the potential for dropping points again is much greater. The chance of winning the Europa League so they automatically qualify for the Champions League.