Mohamed Salah and Kevin De Bruyne had their Chelsea careers ended prematurely due to a "personality clash" with then-manager Jose Mourinho.
That's according to the club's ex-head of loans, Eddie Newton, who worked closely with all three in the early to mid 2010s.
Salah and De Bruyne are now two of the world's best players at Liverpool and Manchester City respectively, but their time at Chelsea was rocky.
Having gone on to be elite level players, it's clear to see a lack of talent wasn't the issue, which Newton has said was definitely not the case.
Instead, he believes their struggles to establish themselves at Stamford Bridge were down to their relationship with Mourinho.
"I think Salah and De Bruyne wasn't about talent," Newton told Goal.
"It was a personality clash [with Jose Mourinho]. I just didn't think it was working at the time.
"I think they were more than good enough, but it was the manager who didn't see eye-to-eye with them, so it wasn't going to work."
The pair's rapid rise to the upper echelons of the footballing world has led to criticism of Mourinho for not playing them while he had them at his disposal.
Who is the best player Chelsea have let go? Let us know in the comments section.
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De Bruyne was with the club for just two seasons despite signing for £7m aged 20, and was back in the Premier League with City after only 18 months at Wolfsburg in Germany.
Salah joined in the same transfer window that the Belgian departed, signing for £11m at 21 years old but spending most of his time on-loan in Serie A with Fiorentina and Roma.
They made just three and 13 appearances for the Blues respectively.
Mourinho publicly criticised the Egyptian following a League Cup game against Shrewsbury Town which practically spelled the end of his time with the club.
Romelu Lukaku was another player who slipped by the wayside during that period, though Newton feels his departure was different to the other two.
He said: "For Lukaku, he wasn't ready at the time, and I don't care what anyone says. He just wasn't ready to be the main number nine up front and carry that platform like Didier [Drogba]."
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