#2 Samuel Eto'o
The Cameroonian worked under Mourinho at Inter Milan and Chelsea. Mourinho was one of the reasons in Eto’o taking the decision to leave Inter for Chelsea after the pair combined rather well to win the 2010 Champions League. It was during their time together at the Blues when their relationship completely fell apart.
The first signs of the strained relationship came out in the open when the Portuguese boss joked about the player's advanced age. Not taking this too well, Eto’o responded saying "I may be 50 years old, but I'm still scoring!"
Speaking at a launch of the first of nine graphic novels about his life, Eto’o said "I remember many games when we were fighting and we said some terrible things to each other.”