Manchester United head into the clash at the KCOM Stadium with a healthy advantage after last week's 2-0 first-leg win at Old Trafford.
Mourinho has made five changes for tonights match, bringing Matteo Darmian, Marcos Rojo, Michael Carrick, Jesse Lingard and Marcus Rashford in to the starting XI.
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Manchester United boss Jose Mourinho is expecting a tough clash against Hull
And the United boss is expecting a difficult test against Marco Silva's side.
"Normally there is an immediate effect of a change of manager," Mourinho told MUTV.
"It brings something positive in terms of motivation to the players.
Man United stars forced to drive down a farm track to get to training
Thu, January 26, 2017
Manchester United players were forced to take a detour down a tiny farm track in order to reach their Carrington training base on Wednesday
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Manchester United stars were forced to take a detour to training on Wednesday
"But I know Marco well. He is a good coach, he is going to effect the team and improve it.
"I know that they are playing better. I know that they are bringing some players in who I already know that have played in Portugal.
"So I think it's going to be difficult, they have the dream and the dream is alive."
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