The three-time Premier League winner did not imagine his former player would become a manager, but has been impressed with his work at Wolves
Jose Mourinho believes fellow Portuguese manager Nuno Espirito Santo is doing "fantastic work" at Wolves as he prepares to face his former player.
Wolves visit Manchester United on Saturday having won their last two Premier League games 1-0 against West Ham and Burnley respectively, although Mourinho's men are also in good form having won three in a row in all competitions.
Last season's Championship winners sit ninth in the Premier League having made eye-catching signings including Portugal internationals Rui Patricio and Joao Moutinho.