Cape Town - Petr Cech started on what could be his last appearance for the club as Chelsea wrapped up their 2014/15 title winning season with a 3-1 win over Sunderland.
Diego Costa confirmed his status as the club's number one striker with his 20th league goal of the season, a 36th minute penalty to cancel out Steven Fletcher's opening goal before Loic Remy completed the win with two second half goals.
The Chelsea goalkeeper, 33, is keen to move in search of more regular first team football and has been strongly linked with Arsenal, but Mourinho has not given up hope of keeping Cech.
"I keep saying the same. He's a legend of this club, but he's a legend at 33. Thirty-three for a goalkeeper is a very young legend," Mourinho said.
"One of our strengths this season was to have the two best goalkeepers in the Premier League. When Thibaut Courtois was injured, Petr made decisive saves in matches for us.
"I'm not sure if Petr was not here in these seven matches if we could be champions, so his contribution was decisive.
"But we also have to be fair, and not emotional with our analysis, and say that Thibaut is an amazing goalkeeper who had a fantastic season for us. He's a big champion."
Members of Chelsea's 2005 title-winning team were reunited before kick off and Mourinho said: "For me, to have here today the champions of 2004-05 and the champions of 2014-15 is an amazing feeling because I feel as if I belong to both.
"I belong to two generations. To be back for the end of my team was hard. To see Ashley Cole, Frank Lampard, Michael Essien and Didier Drogba leave is very hard.
"But my job is Chelsea's future and Chelsea's future is this team that we've been working with in the last few years.
"It would be a dream to be here in 2025 and be with the champions of 2005, 2015 and 2025."