Tottenham beat Ajax on away goals after the tie finished 3-3 thanks to a second-half Lucas Moura hat-trick in Amsterdam.
And Mourinho believes that if Klopp fails to win his third European final in four years, he will find it seriously hard.
"If Jurgen wins, it's an incredible achievement for him," he told Sky Sports.
"If Jurgen doesn't win, you know... to lose three Champions League finals... phew... that has to be really, really hard.
Jurgen Klopp is looking to win the Champions League with Liverpool (Image: GETTTY)
Jurgen Klopp is looking to win the Champions League final with Liverpool (Image: GETTY )
"But he is a very positive guy, I'm sure he's just thinking about winning.
“Being a manager, and understanding what it means for a manager to play a Champions League final.
“There is always a negative side of it and the negative side is that one team will lose and one manager will lose."
Mourinho went on to opine that Tottenham could see a turning point in their history if they are victorious at the Wanda Metropolitano on June 1.
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