Mourinho did not get the new centre-half he wanted in the transfer window and, from the comments he made after the Leicester match about being a head coach instead of a manager, he is still not happy about it.
But considering Victor Lindelof and Eric Bailly had played so little together in their time at United - just 99 minutes in total before Friday's game - they looked pretty solid and sturdy at the back.
Bailly can be a bit rash and possibly needs a voice in his ear as he is about to dive into a tackle to say 'stand up, stand up' but he got away with it against Leicester and is clearly a good defender.
We have a very strong squad. If you have round pegs in round holes, and all of them are doing the right job at the same time, then you are going to do well.
The best news for Mourinho is that it looks like there were will be a few battles going on for places in his first XI over the next few weeks, all over the pitch.