United midfielder Ander Herrera received his marching orders on the 35th minute after picking up two bookings and Courtous believes it was Mourinho’s game-plan to be overly physical with the Chelsea players.
Not that it affected the mindset of Antonio Conte’s side, as N’Golo Kante’s second-half strike secured Chelsea’s spot in the next round.
However despite Chelsea getting one over their old boss, Courtois clearly wasn’t happy after the final whistle, as he accused Mourinho’s side of dirty tactics.
Speaking to the media, Courtois said: “They made a lot of fouls and they were very hard.
“This was in the style of Mourinho but I think that Ander Herrera paid the price for his team-mates because I think Phil Jones made a fifth foul on Eden Hazard and then Herrera made another foul on him seconds later.”
The Belgian shot-stopper added, “Then the referee must give a yellow card and, unfortunately for Herrera, he already had one.
“United tried to get into our minds, with the fouling and kicking to try to destabilise us. They are the mind-games that they tried to play – they get that from their manager.”
Clearly things didn’t end amicably between Mourinho and Courtois, despite the Portuguese boss being responsible for brining the 24-year-old back from his loan spell at Atletico Madrid in 2014.