Houghton came through the Blues' academy and was pushing for a role in the first team in 2014, during Mourinho's second spell in charge at Stamford Bridge.
"I got (John) Terry's signed shirt in the U9s as he was my idol at the time but I was nervous because I thought I wasn't supposed to do it," Houghton recalled to Goal. "It was surreal that I trained and played with him. I see him as a friend now which is more surreal.
"We played together against Wycombe and AFC Wimbledon and it was under Mourinho. Against Wimbledon, I remember Mourinho absolutely hammering Matic and threatening to get rid of him so that was an eye-opener! I then went on tour with the first team."
Matic is now with Manchester United, while Mourinho is in charge of Tottenham.