I think, Manchester united coach will still give cristiano Ronaldo more opportunity to showcase his skills in their remaining matches to see if the team will increase higher with his performance before they will determine to let him stay through out this tournament or to let him go so that they can bring in another striker. Ronaldo didn't performed well some of the matches Manchester united won to increase higher in this season that made their coach to changed his mind to bench him to allow other strikers that know how to embrace opportunity on time to play first half.
Going with the performance of Ronaldo this season, I don't think the Manchester United coach needs to start Ronaldo ahead of Marcus Rashford in the upcoming games in Europa League. Ronaldo has been a good player for United no doubt but this season his performance, when calculated in percentage, is not up to 50%, the best way to play Ronaldo in the next games is to bring him in the second half whenever Manchester United is winning comfortably or to bring him as a super sub in the team to use his own experience to create a change in the games.