The 'Red Devils' will battle it out with Chelsea on May 19 for the final piece of silverware in England's domestic campagin, one which Mourinho has insisted is a must-win for the club.
"When I don't win, you kill me," he said. "Because I almost do that all the time, when I don't do it, you kill me, which is what you are all ready to do."
The Portuguese head coach has come under fire for the style of play used throughout the season at Old Trafford despite the team being on track to finish in the highest position since Sir Alex Ferguson bowed out as champions in 2013.
"I keep saying that I think we should have probably eight, nine, 10 more points than we had," Mourinho added.
"We could finish this season with 88, 89, 90 points. Not acceptable, the last defeat (1-0 at home to West Brom on April 15). Not acceptable, the performance at Huddersfield (2-1 defeat in October). Not acceptable, the performance at Newcastle (1-0 defeat in February).
He concluded: "So, we lost a few matches that we should do better. Can we improve next season? Let's try".
Mourinho also went on to talk about the gap to rivals Manchester City and how much the club could invest during the summer transfer window.