"And then there is the fact that we have to play many times two days before the big matches in Europe and then other countries protect their clubs".
Mourinho said he had "no complaints" about how English football was set up and that he had the option to rest players.
"The only match that we decide to play with three [against Stoke City] he played". After leaving the field in the first 20 minutes, the FC crew assess the implications for Man United without Paul Pogba.
Herrera was one of the best players for United last season, and has enough talent to recover his starting spot in midfield.
"I just know from experience it's a muscular injury", Mourinho said.
"I played my own game and did what I was told to do on the pitch".
"Ashley Young was not on the bench in the last match and today he started the match and he played for 90 minutes, and the next match you can have another surprise of some player that you think is going to play and is not going to play".
Jose Mourinho's side have already scored an impressive 15 goals in just five games across all competitions this season, and now sit top of Group A after beating the Swiss champions at Old Trafford.
Mourinho opted instead to pick Pogba and Nemanja Matic with Marouane Fellaini and Michael Carrick on the bench, leaving no room for the club's reigning player of the year.
The Red Devils manager hinted that France midfielder Pogba could be missing for United's clash at home to Everton in the Premier League on Sunday.
"They're killing teams off". They are all good players and I think it's easy to play with them all. "He's a very important player for me".