The Portuguese coach is under pressure at Stamford Bridge, after the Blues lost six of their opening 11 Premier League matches.
Mendes insists his client is the best in the world and that no other manager can fill his shoes.
“He doesn’t need to prove anything to anybody,” he told BBC Sport.
knows what to do. Many people are saying these things but there is no
chance [he will leave]. He will solve the problem. He is the best.”
eased some of the scrutiny with a 2-1 win over Dynamo Kiev on Wednesday
night and Mendes added that a coach must have good and bad moments.
He said: “At FC Porto he won the Europa League, the league, the Champions League. He won everything.
“After that, in Chelsea he was amazing. After 50 years, he won the league and everyone was very happy with him.
“At Inter Milan, nobody expected Inter could win the Champions League – no way. Even the quarter-finals seemed quite impossible.
“At Real Madrid against the best team in the world, he still won the league. He is special.
“The reaction from the supporters tells you everything. They like him.
players, coaches, you have good moments and bad moments. It is
impossible to find someone like him to solve the problem.”