The striker, who made his name at the Liga leaders, is in line to face his former side after Samuel Eto'o suffered a knee injury, with his coach confident in his mental state
The Spaniard has fallen down the pecking order at Stamford Bridge but is in line to face the Liga leaders in Tuesday's first-leg clash after Samuel Eto'o did not travel with the squad due to a knee injury.
Torres came though the youth ranks at the Vicente Calderon, scoring 91 goals over seven seasons in the first team before joining Liverpool in 2007, but Mourinho is not concerned by his striker's state of mind ahead of the fixture.
"Playing in the Champions League is a big motivation for every player. Everyone wants to play. Those chosen are happy those who aren't, are not," he told reporters.
"I am not saying that Fernando Torres will start, I am saying that he never hides. We feel that every day. He is a real Atletico supporter, I would say a big one. We talk about Spanish football every day.
"He is a professional. I have no doubts that the minutes he will be on the pitch tomorrow he will do everything for Chelsea given the professional that he is."
Mourinho also refuted claims that Atletico Madrid counterpart Diego Simeone is a superior coach to him.
"I don't agree," he said. "It is difficult to compare coaches; in fact it is not fair to do so.
"It is not fair to compare someone with 15 years of experience as a coach to one with less than that. It is something that I don't like to do."
After suffering semi-final defeats to Liverpool during his first spell in charge of Chelsea, Mourinho insists those disappointments do not provide extra motivation.
"I have no unfinished business with Chelsea in in the Champions League," he said. "I did my best. I always do my best. Sometimes you win, sometimes you lose.
"In one semi-final we lost on penalties and in the other we lost because of a goal that wasn't a goal [a reference to a shot from Luis Garcia that was adjudged to have crossed the line], but that's football."