Chelsea manager Jose Mourinho didn't want to give too much away on Willian joining Chelsea from Anzhi Makhachkala after it looked as if he was about to join Tottenham.
'I think he's already made his decision. I don't like to speak before time because football can betray you.'
The striker is currently in advanced talks with Chelsea whilst Mourinho elaborated on his transfer policy.
'I could not say much in previous press conferences. I have to try to be honest, and try to hide a few things.
'If you remember, I said I am happy with my squad but every manager says we are happy but we almost want something more and we never close the door. Before the Villa game I told you that we had Plan B and Plan C. The point is not to sell, I want a 22-man squad. We do not need to sell.'
He also indicated the signing of the Brazilian forward will not mean that Chelsea will cool their interest in Manchester United’s Wayne Rooney, who the Blues face on Monday night.
Even with the addition of Willian, Spanish attacker Juan Mata would not be deemed surplus to requirements, as Mourinho stated: 'He is a player we all like, a player we all want to keep. We want more quality not less quality.'
Chelsea travel to Old Trafford to take on Manchester United on Monday evening, August 27, and Mourinho wants to develop the same kind of relationship with David Moyes that he enjoyed with previous United boss Sir Alex Ferguson.
'For me, the difference is the routine of meeting a friend, of being together and relaxed before the match and have the guarantee that after the match, independent of the result, we will be together and enjoying our time and having a laugh.
'With David, we don't have this type of relationship but we have a good one, so we can start this kind of very nice relationship like I had with Sir Alex no problem.
'It is not manager v manager, but club v club, 11 v 11, big player v big player. We will just do our job.'
David Luiz could feature on Monday night but Mourinho said if he doesn’t then he should be fit to feature against Bayern Munich in the Super Cup.
Manchester United manager David Moyes, meanwhile, has reiterated his stance that Wayne Rooney is not for sale, and is relishing Monday night’s clash.
'I hardly need to repeat it. It doesn't need to be said. I came to Manchester United for this level of match. I also came to win trophies. To do that you have to beat the likes of Chelsea.'