Roy Keane is famously not one to ask for autographs, but he made a rare exception for one of Hollywood's biggest stars during the latest episode of The Overlap

Former Celtic star Roy Keane has shown a rare softer side after being left starstruck by Hollywood legend Sylvester Stallone.

The famously no-nonsense football pundit, who spent a brief spell at Celtic towards the end of his playing career, appeared to drop his tough-guy persona when the Rocky and Rambo actor made a special appearance on The Overlap.

Keane, 54, is better known for his straight-talking approach and famously frosty attitude towards fans who approach him in public than for showing his admiration for celebrities, reports Cork Beo.

But the former Manchester United captain appeared to be a genuine fanboy as Stallone joined the latest episode of the podcast, alongside Keane, Gary Neville, Jill Scott and Ian Wright.

The group revealed that Stallone was the only guest they had ever travelled specifically to meet, although Keane initially tried to play down his excitement.

The Irishman was wearing a T-shirt featuring Stallone as Rambo, however, giving away his enthusiasm before the Hollywood star had even arrived. When Jill pointed out the shirt, Keane admitted he was a big fan of the film. Neville then asked whether he would turn into a "fawning schoolboy" when Stallone appeared.

"No, Gary, don't be silly, I'm a professional," Keane replied. But after a brief pause, he added: "He might sign it for me."

When Stallone eventually walked into the room, Keane could be seen straightening his shirt, with the moment prompting fans to remark on the unusual sight of the famously stern pundit looking genuinely starstruck.

His choice of clothing also caught the actor's attention, with Stallone telling him: "Nice shirt."

The group then settled down for a lengthy discussion about Stallone's remarkable Hollywood career, his rivalry with Arnold Schwarzenegger and his views on who deserves to be considered the greatest actor of all time. The full episode has yet to be released, leaving fans waiting to find out whether Keane managed to secure the autograph he appeared to be hoping for.

It is an unusual position for the former Celtic midfielder, who has built a reputation for having little patience for fans seeking photographs or autographs when they approach him in public. Keane's attitude towards such encounters recently made headlines after a fan claimed he had received the "full Roy Keane experience" at Cork Airport.

The supporter said he had called out to the former Manchester United star to ask for a photograph, only to receive a stern response about approaching him in public while he was trying to be discreet.

Keane later addressed the incident on The Overlap, making little effort to hide his irritation.

"What is it? What do you want me to do? The guy was a pest! What is funny about? What am I supposed to do, do a dance for people?" he said.

"They're shouting your name out loud. What are you shouting my name for? Just come over and be polite. He knew what game he was playing."

The exchange offered another reminder of Keane's famously uncompromising approach to fame.

But with Stallone, the former Celtic star appeared more than happy to make an exception, showing that even one of football's most intimidating personalities can have his own Hollywood hero.