Cape Town - Circumstances surrounding the signing of Cesc Fabregas by Chelsea were not as 'clean' as purported to be, according to Arsenal manager Arsene Wenger.
The Spain midfielder is expected to feature as Chelsea take on the Gunners in a much-anticipated Premier League encounter this weekend.
Fabregas was sold by Arsenal to Barcelona in June 2011, and it was suggested the North Londoners would have first refusal on the Spaniard should he decide to return to England.
However, the midfielder ended up joining Mourinho's Chelsea, despite the Gunners having the opportunity to bring him back to the Emirates.
While Wenger refused to go into any detail, he suggested there was more to Fabregas' switch to Chelsea than meets the eye.
"I cannot speak to you about that (reasons) now because that will not help us to win the game on Sunday," Wenger said.
"We will have to discuss that one day, with all the terms. It is not as clean as that.
"The regret I have is that he wanted to leave here. This club and myself had a very positive influence on Cesc's life, so I would be a bit uncomfortable to have to justify today why he is not here. I believe I would rather it was the other way around."
Wenger was keen to dispel ideas that a confrontation between him and Mourinho became the highlight of the last clash between the two sides.
"It is not a confrontation (between managers), it is a confrontation of two teams. Football is down to the fact that the performance on the day will decide the game and the result, so let's focus on that," Wenger added.
"We have not always lost, first of all, in 12 attempts. We have come close to beating them a few times and they have always had very strong teams.
"We are on a good run and we have an opportunity to beat them at home, and we want to take it."