United picked up another three points on Saturday thanks to Ashley Young’s deflected shot against Brighton.
The full-back’s strike took a huge deflection off Lewis Dunk, spooning over Mat Ryan and giving Mourinho’s side a slender victory at Old Trafford.
Marcos Rojo could be set for a return to Premier League action against the Hornets, having completed 90 minutes against Basel last week.
The Argentinian has recently returned from a long-term ACL injury, but may be risked with both Phil Jones and Eric Bailly out injured.
Michael Carrick is also sidelined as he recovers from a heart condition.

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Scroll through the gallery above to see how Manchester United could line up when they take on Watford.