If Manchester United has any desire to target the Europa League, Ten Hag's men have that opportunity. however, the road facing United first was toppling Barcelona. yes, Ten Hag must make sure his troops overthrow Barcelona first. the reason is, the Europa League playoffs still have a long time lag for United. that way, United still have plenty of opportunities to improve their troops. I'm sure, Ten Hag is a coach who will bring United even better after Ferguson left. United's only problem at the moment is not having a real striker. Game-wise, Manchester United is on the right track. it's just that, Ten Hag still needs his troops to be able to compete at various levels of competition.
Yes, Arsenal is a strong candidate. however, trouble came to the Gunners after one of their strikers was confirmed absent due to injury. As for Barcelona, at least Xavi's troop squad must first prove a win in the playoffs. that way, they have the opportunity to compete for the Europa League trophy.
Manchester United still facing with Barcelona in play off round and seems not easy after leaving by Cristiano Ronaldo who have good record against Barcelona, I know with Manchester United is not strong candidate to win Europe League but seems realistic after looking opportunity with domestic league tittle almost close for Manchester United.
Europe League is most realistic chance for Manchester United to get tittle in this season with new manager Erik Tan Hag, but I think have little impact after conflict with Cristiano Ronaldo. He has experienced and know weakness from Barcelona after won several games trough still with Real Madrid and Juventus.