The Scotsman was known for losing his temper on players, especially earlier in his career, when he was not happy with their application.
Fabio, who is now 31, admits people often got him and Rafael mixed up in a professional setting.
"When we arrived from Brazil, there was no one who could tell us apart," Fabio told The Athletic.
"You would arrive for training and, in the space of a few minutes, people would say 'good morning' twice. You had already said 'good morning' to that same person just a few minutes earlier and now they were saying it again."
"I'd plead my innocence and he would get angrier for a second before he realised the entire dressing room was quiet because I was telling the truth," added Fabio.
"'Oh, f*cking hell', he would say, and then everyone would just burst out laughing. Him, too."
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