"If I play a player against Bournemouth and he plays phenomenal, he plays the semi-final", Mourinho said.
The former Red Devils defender told Sky Sports in the wake of a shock 1-0 defeat to West Brom which handed the top-flight crown to City: "It was dismal, it was a dismal day".
"Do you want me to go for the price they cost, their salary, their attractive face?"
"Some of the guys that played (against West Brom), they don't have a place in that team".
The Daily Mail reports that Mourinho will put Pogba up for sale as soon as the season ends, but he will face some resistance form the United board.
In seven out of 12 games since their exchange at Spurs, Pogba has either come off the bench, been replaced or not played at all, culminating in his early withdrawal from Sunday's dismal defeat by West Bromwich.
Far from feeling embarrassed at paying £89million for a midfielder who left for next to nothing, the United hierarchy saw Pogba's fee as a symbol of the club's spending power and ability to beat Real Madrid to the most expensive player on the planet.
"If they play hope they play well but you couldn't argue against Rashford, Martial, Mata, Lingard etc in front of them!"
Mourinho was asked to clarify whether players would be dropped specifically due to their poor showing against West Bromwich, and he replied: "Yes".
'I had to make a decision one midfield player out to bring in Jesse Lingard and then after that I wanted more width.
A season-defining week for United kicked off in embarrassing fashion on Sunday when rock-bottom Baggies claimed their first Premier League win in three months, sealing the title for City in the process. "The only way to go is with the performance".
A first-half yellow card contributed to Mourinho's decision, but the France global had struggled to find the form that saw him score twice in the 3-2 victory at Manchester City.
"You don't win titles with inconsistency", Mourinho said.
"And he had a yellow card, so he was in a more hard position than others".
"You can do it if your team is not losing the ball, but our team was losing the ball so easy with the complication, everything was complicated, so we were losing lots of balls". "He had a yellow card so he was in a more hard position than others and playing with only two midfield players, you can not play with one player in risk of not being able to make a foul".