Cesc Fabregas once completely lost his cool and started a training ground brawl after being embarrassed by a Chelsea academy player.
Back in December 2015, Belgian teenager Charly Musonda flicked the ball over Fabregas' head during a training session before nutmegging him, which left the Spaniard raging.
The former Barcelona and Arsenal midfielder reportedly lunged at Musonda with both feet, and the two needed to be forcefully separated after squaring up to one another and exchanging some angry words, it was reported by MailSport at the time.
The incident occurred just a few days before the end of Jose Mourinho's second reign at the club, with Chelsea languishing just a few points above the relegation zone following an absolutely torrid start to the season.
Tensions were understandably high with the defending champions winning just four of their first 16 league matches.
The reaction was totally out of character for Fabregas, who was very much seen as a mentor to Chelsea's academy players at the time.
It's understood that the matter was dealt with by Mourinho on the day and no action was taken against either player.
Musonda, who is still under contract at Stamford Bridge, is another of Chelsea's supremely talented youngsters who failed to live up expectations.
Just like Gael Kakuta and Josh McEachran before him, Chelsea had sky-high hopes the young Belgian would blossom into an invaluable member of the first team, but a couple of unsuccessful loan spells and an awful posterior cruciate ligament injury have completely derailed his career.
Who's the one Chelsea youngster you still can't believe didn't turn into an amazing player? Tell us in the comments section below…
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In November, the 25-year-old announced he wouldn't be extending his contract with the Blues, which expires in six months, thus ending his 10-year association with the club.
Fabregas meanwhile went on to star for Chelsea during their title-winning campaign the following season under Antonio Conte.
He eventually left the club and joined Monaco in 2019 after seeing his game time slashed by Conte's successor Maurizio Sarri.
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