Former Chelsea striker Tammy Abraham has recorded five goals and two assists in his first 17 outings across all competitions for Roma.
The 23-year-old moved to Roma to up his game after a lack of playing time at Chelsea under Thomas Tuchel.
The Blues academy graduate is doing well in Rome and has progressed a lot under Mourinho.
Pressed on what he has learned from Mourinho, Abraham told reporters while away on international duty that Mourinho has taught him to be a monster.
He said: “Just be a monster really!
“I think one of the things he said was I was too much of a nice player and that you have to show that aggressiveness as you’re getting older as a striker.
“It’s not always about being nice on the pitch. You need that character, you need that presence to frighten defenders and I think that’s something I’m learning and getting better at.”
Chelsea inserted a buyback clause in the Tammy Abraham deal, and it can be triggered in two years time.