According to reports, Jose Mourinho’s move to Manchester United is experiencing a little delay because the Blues still own him. The Portuguese ceded control to his name allowing Chelsea to retain trademark to the name ‘Jose Mourinho’ even after leaving the club.  
Although he has agreed personal terms at Old Trafford, another thing delaying his announcement is conflict in sponsorship deals. The Special One has a sponsorship deal with Jaguar and the Red Devils sponsor is Chevrolet, so the board are trying to get him to switch cars.