The Blues have just two days' rest between the trip to Anfield and the visit from Atletico Madrid, and the manager could field a weakened side against Liverpool.
Petr Cech and John Terry were forced off with injuries during Tuesday's 0-0 draw with Atletico Madrid in the Champions League semifinal first leg — with the goalkeeper's season now over and the club captain in a race to be fit for a potential trip to the final.
Mourinho has questioned the timing of the trip to Anfield, leaving just two days' rest before Atletico travels to Stamford Bridge for the return leg.
"I can't decide [the team to face Liverpool] by myself; that's a decision where I have to listen to the club. I'm just a piece, the manager and no more than that," he told reporters. "The fact the match is on Sunday puts the problem not in my hands, but the hands of the people who decide the game should be played on Sunday, not Saturday or Friday.
"We represent English football, we are the only English team in Europe. Spain has four teams and gives them all the conditions to have success."
Mourinho also insisted Chelsea did not play for a goalless draw during the game, despite managing little possession.
"It wasn't the result I wanted before kickoff, but I didn't want to start the second leg a goal down either," he said. "A goalless draw is not a positive result for a team playing the second leg at home, but it'll do. Atletico were frustrated, whereas usually they are the ones who frustrate other teams. My side had a solid performance; we played in a way that irritated them."