Casemiro deserves appreciation in this regard because apart from being able to score a goal early in the match in the 6th minute, he was also able to excite the other players against Chelsea so that there were four different players who were able to score goals in that match even though one of them was through penalty kick by Bruno Fernandes in the 73rd minute. But it is very clear that Manchester United is much more lively in the game when Casemiro is there even though the opponent is less tough because Chelsea's strength this season really looks very weak.
Yes, it's true that Casmiro played very well against Chelsea, apart from scoring goals, he was also part of the process for the second goal. I see Casemiro is a very extraordinary player and he is a great signing for Man United this season. He also easily adapted to the Premier League, which we know is a very tight league. Maybe without him Man United might not qualify for the UCL next season.
With the win against Chelsea, Man United is safe in the top 4 Zone. What ETH has done this season with this squad is amazing. I think it's time for Man United to rest their key players against Fulham and prepare to face Man City. The game was huge for many reasons one of them being wanting to win win the FA Cup this is going to be a brilliant season for ETH and Man United.