For now, Man United still has a chance to break into the top four of the standings, because they are only 6 points behind Chelsea, but on the condition that they must rise and perform consistently in the future and hope that one of the top four teams stumbles. Regarding Ten Hag, his words cannot be fully trusted, he is very good at spreading sweet promises to fans after the match is over. Regarding player injuries, Ten Hag should be able to experiment to reduce the burden on players in the main squad, in order to minimize injuries.
After losing badly to Tottenham, it is certainly difficult to rise and get full points at Porto home. If The Red Devils manage to bring home 3 points from the Europa League, that's right, their next match against Aston Villa in the Premier League is very troublesome. Moreover, considering the strength of Unai Emery squad which managed to beat Bayern Munchen in the Champions League, it seems that Ten Hag will have big problems in the two matches. In short, it seems that only luck can save Ten Hag position at Old Trafford.
Manchester United still has small chance to reach top four but they need to play well consistently and hope another top team makes mistakes. However manager Erik ten Hag mostly makes promises he can not keep. To avoid player injuries he should try different team lineups. After losing badly to Tottenham winning at Porto in Europa League will be tough. Next game against Aston Villa who beat Bayern Munich will be even harder. Ten Hag job at Manchester United is in danger and he needs luck to turn things around.
I am not sure Manchester United can reach the top 4 this season if their performance is still inconsistent because the Premier League is a place where the competition is very tight, there are clubs that are more convincing than Man United such as Aston Villa, Tottenham Hotspur, Chelsea who might compete to reach the top 4, for Arsenal, Liverpool and Manchester City who might be ranked 1-3.
If Man United still retains their coach Erik Ten Hag I completely doubt it but if Man United fires him and replaces a coach who has better abilities to handle the team I think Man United still has a chance to compete for the top 5.