The Serie A side go into the second leg at Stamford Bridge with a 2-1 advantage and Mourinho believes his side can progress to the quarter finals.
The former Blues boss also claims it is not important that he is facing his former club and the most important thing is to progress to the next round.
"The point of Chelsea is not the point for me," Mourinho told reporters.
"The point for me is that we want to go to the quarter finals and if we reach the quarter finals tomorrow it will be an important moment for Inter, especially with a team who have not won the Champions League for many many years.
The 'Special One' returns to Stamford Bridge as a manager for the first time since he left the club three and a half years ago and believes he has nothing to prove.
He said: "I have nothing to prove to Chelsea, nothing to prove to Chelsea players, Chelsea fans and the board.
"The only thing I can do is prepare for the game with all my qualities, with all my motivation and play the game tomorrow from my place with everything I have."
Chelsea are without first choice goalkeeper Petr Cech who was injured in the first leg, as well as number two stopper Henrique Hilario, so will have to start with the inexperience of Ross Turnbull.
Mourinho however, does not feel this is a huge issue.
He added: "I watch Petr [Cech] leave the stadium in Milan in difficult circumstances.
"It looks like he's not selected, he's one of the best goalkeepers in the world so it's a pity for Chelsea.
"It's not the first time a team plays with the third goalkeeper to be fair I don't know their goalkeeper [Turnbull] very well."
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