Mourinho opted to leave him on the bench - and didn't even bring him on as a substitute - as United ran out victors against the Clarets at Turf Moor.
Instead, the manager went with Marouane Fellaini in midfield.
Explaining his decision, Mourinho said: "They are physical, they are direct. They go very direct to the box, they try to create crossing situations, they try to have lots of set pieces.
"They are very pragmatic and we thought that we need a little bit of Marouane's physicality for that."