The two Portuguese managers will be in opposing dugouts for the first time when their teams meet in the Premier League, four years after Villas-Boas quit Mourinho's backroom staff at Inter to take a job back home with Academica. (Agencies)
The pair had been close, Villas-Boas working under Mourinho at Porto and Chelsea before the spell together in Serie A signalled the end of their working relationship.
The Tottenham manager had been an opposition scout for Mourinho but wanted a more hands-on coaching role, only to be rebuffed.
"My relationship with him professionally and personally was excellent, as you can imagine, because we worked so many years together," he told reporters at Tottenham's training facilities in Enfield on Friday.
"Our break-up point was because I was full of ambition to give him something extra and I wanted further involvement to the job that I was doing at the time which was scouting and match preparation,” he said.
"I felt that I could give him much more so my initial idea was to keep working with him but he did not feel the need for someone near to him or in another position as an assistant and because of that we both decided it was time," he added.
Villas-Boas denied there was any on-going feud between the coaches who have strikingly similar career paths with varying degrees of success. They are on speaking terms, but are no longer close friends.
"We talked at the Premier League managers meeting when we were there in August, but since then no," Villas-Boas added.
The Tottenham boss may feel he has a point to prove at White Hart Lane against the team who sacked him after only eight months in the job.
The two Portuguese managers will be in opposing dugouts for the first time when their teams meet in the Premier League, four years after Villas-Boas quit Mourinho's backroom staff at Inter to take a job back home with Academica.