The Red Devils qualified for the semi-finals of European football's second biggest club competition after Marcus Rashford scored an extra-time victor to send the English side through with a 3-2 aggregate win.
Mourinho last week said the England centre-backs were out until mid-May, but suggested after the Anderlecht win that they need to be "brave".
Mourinho also commented specifically on the injuries to his central defenders: "It is time for Jones & Smalling to be courageous & to risk".
"We can not do miracles". I do not know the extent of his injury, of course, but I saw him in there and he was optimistic. There are no miracles but with special spirit you can sooner than expected.
"I think we had like 17 shots and 10 on target, something like that but the game was hard".
Defender Rojo, 27, departed the game at Old Trafford after 23 minutes with a suspected knee injury.
Asked how he felt about this, Fellaini said: "Honestly, I just smiled".
"I prefer to wait for all the tests to be done tomorrow then speak what I feel". "I am exhausted, I imagine the players are more exhausted than me, but we are in the [semi-final] draw [on Friday] and we still have the dream to win the competition".
"So instead of come (back) mid-May you can come beginning of May".
"These sort of things make me trust the players". "Always trust them. Luke Shaw did something new today, it means a lot for me".
United was joined in the semifinals by Celta Vigo, which ousted Genk 4-3 on aggregate after a 1-1 draw in the second leg, and Ajax, which needed extra time to see off Schalke and reach a first European semifinal in 20 years.
Pogba, on the other hand, now leads the Europa League with most passes completed at 664 (i.e. before this game) and that pass to Rashford was as pivotal and classy as it gets.
It was the second leg of the Europa League quarter final between the Red Devils and the Belgian minnows. But we are through - that is what you have to do in cup competitions. "If one day it is not mathematically possible we have to put everything in the Europa League because the Europa League is an important title and on top of that the bonus of playing in the Champions League".