The ex-Inter boss has been heavily linked with replacing the 71-year-old when he finally decides to call time on his reign at Old Trafford.
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However, Mourinho, 50, has insisted he will not be replacing the Scot, telling reporters: "No because we have to end our career at the same time. He at 90, me at 70.”
Goal.com exclusively revealed the ex-Chelsea tactician is unlikely to replace Ferguson, with a number of senior figures in the Red Devils’ boardroom harbouring concerns that he could prove to be too high maintenance.
Mourinho also revealed that his next managerial job when he departs Real Madrid will be to return to coach in England, where he has previously enjoyed a hugely successful spell in charge of Chelsea, adding: “The Premier League will be my next step.”
He has been linked with a summer return to the Blues, with Rafa Benitez thought to be unlikely to remain at the club beyond this season, as well as current Premier League champions Manchester City.