Rooney was 21 when he helped carry Hatton’s championship belts into the ring alongside legendary Mexican boxer Marco Antonio Barrera before the Castillo fight.
“It was one of the most nervous I have ever been,” said Rooney.
“I was in the pool all day in Vegas, it was hot, and my face got a bit burnt, but then I remember standing in the dressing room and being nervous.
“He hadn’t lost at that time. I was thinking, ‘He does not lose tonight. Is it on you? Is it your fault?'”
Hatton went on to retain his IBO light welterweight crown with a stunning fourth-round knockout.
Rooney said they went to a beach party afterwards with family and had “a great day”.
He added: “So often you see any type of celebrity who are not really relatable, but Ricky was certainly relatable and good fun to be around.”