His Manchester United side came from behind to beat Blackburn and were then handed a return to Stamford Bridge – where they were hammered 4-0 earlier this season.
Mourinho started by saying Chelsea will only focus on the FA cup as they are already Premier League champions.
United have not won at Chelsea since October 2012.
Tottenham will host another giantkiller in Millwall, who ousted English champions Leicester.
Premier League outfit Middlesbrough will host the winner of the replay between Championship side Huddersfield and Manchester City.
