Despite winning a famous treble together in 2010, Jose Mourinho and Samuel Eto'o's relationship turned slightly sour years later when the Portuguese tactician suggested the Cameroonian might have been lying about his age.
The former FC Barcelona striker joined Inter Milan in 2009 off the back of an incredible treble under Pep Guardiola, and claimed a second treble the next year. To this day, Eto'o is still the only player in history to have achieved this feat.
The Cameroon legend then reunited with Mourinho at Chelsea in the Premier League three years later, but was unable to replicate the form he had shown in previous years. After scoring just 12 goals in 35 games, the former Indomitable Lions skipper left the Blues for Everton.
Despite relations appearing to be healthy between Eto'o and Mourinho, a private conversation a French broadcaster had with the ex-Real Madrid boss was leaked in February 2014, in which the manager seemed to raise concerns about Eto'o'os age.
Click through the gallery below to see 10 footballers who famously lied about their age!
In the conversation about the Blues' struggles at the time, Mourinho reportedly said that "the problem with Chelsea is we lack a scorer. I have one (Eto'o), but he's 32. Maybe 35, who knows?", comments that made its way back to the forward.
Soon thereafter, Eto'o branded Mourinho a "fool" for questioning his age, but in a recent interview, the African superstar appeared to bury the hatchet when asked about his former boss, with the Africa Cup of Nations' all-time top goalscorer saying the Portuguese will always be in his thoughts.
"Mourinho will always remain in my heart, a great person as well as a great trainer," he told Sportmediaset.
Do you think Mourinho should have received even more flack for questioning Eto'o's age back then? Let us know in the comments section below.