The Portuguese manager led the Blues to two Barclays Premier League titles in his first spell between July 2004 to September 2007, as well as an FA Cup and two League Cups.
Mourinho now looks set to return to Stamford Bridge for a second stint in charge after spending time at Inter Milan and Real Madrid.
His summer departure from the Bernabeu is already confirmed and Ba is excited by the prospect of working with the 'Special One'.
"You see what he has won, what he has brought to his teams and to his players individually, and of course he is one of the best," he told Sky Sports News.
"He knows everything about Chelsea having already managed the team for three or four years. He knows everybody here and he knows the club.
"Everybody is thinking about it and everybody is happy. They know that he is a person that wants to win."
- Sports & Recreation
- Inter Milan