A number of players have been linked with a move out of the Santiago Bernabeu this summer, namely midfielders Nuri Sahin and Kaka, while Tottenham Hotspur playmaker Luka Modric is reportedly set to join the Spanish giants.
Mourinho has now given a strong indication that he may not make too many changes in his squad, claiming that he already has some of the finest footballers in the world.
"We are preparing rigorously because we know that it will not be easy," said the Portuguese. "Our squad is almost complete. These are very special players, some of the world's best.
"There is a lot of passion when it comes to Madrid and the Champions League, but what we want is to win titles. In my opinion, winning the league with a record amount of points is something difficult and unique."
Madrid, who won La Liga last season but failed to progress beyond the semi-finals of the Champions League, are currently on a pre-season tour of the USA.