United has some tough fixtures upcoming like Wolves, Fulham and Chelsea which can make things difficult for them to finish top 4. At current state, with injuries and all its a tough job for ten Haag to manage his team. United needs someone aside from Rashford to step up and start scoring for them. Lately, they have been unable to score in games. Wolves can prove to be tough opponents at times also. They might not be in good shape right now but don't undermine Wolves at all.
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If you look at the list of Manchester United's opponents for the rest of the season, I think Manchester United's chances of finishing in 4th place are very slim. I don't see Chelsea as a suitable enough opponent for Manchester United this season, but it is possible that Frank Lampard's squad can reverse the prediction with a win because Chelsea still needs points to finish in a better position.
Then there are Wolves and Fulham, I think these two teams can be a very troublesome obstacle for the red devils. Regarding Rashford, at this time he has run out of motivation and is starting to weaken to do his job of scoring goals and I totally agree that Erik Ten Hag must immediately look for options to replace Rashford so that Manchester United can score goals even easier. But I still hope that Manchester United can still finish in 4th position because I haven't seen this team in the Champions League competition for so long.