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Former United skipper Keane bought the custom-painted gold DB7 vehicle to celebrate Manchester United's 1999 treble winning season, when the club won the Premier League, FA Cup and Champions League in the space of 10 days.
22 years on, the 3.2L grand tourer is currently being advertised by a private seller on Auto Trader for £29,500.
The car, which produces 335bhp and boasts full black leather interior, also comes with a signed letter from Keane himself to prove there was no damage done under his ownership - as well as a 1999 United shirt complete with the autographs of the whole squad and manager Sir Alex Ferguson.
Auto Trader's Rory Reid said: "Roy Keane bought this Aston Martin to celebrate Manchester United's iconic Treble win of '99, standing out as the best four-wheeled piece of memorabilia to mark a golden milestone in the club's history.
"Now someone else has the opportunity to own such an iconic souvenir - not just the car but the signed shirt! This is surely the perfect match for football fanatics and especially Man-U followers."
Keane enjoyed driving the vintage vehicle but he once prompted Peter Crouch to get rid of his Aston Martin in the same week he bought it just courtesy of a look he gave him.
The king of the robot got a bit too excited when he completed his big move to Liverpool and swapped his Renault Megane for the supercar.
For one, the 6 ft 7 striker struggled to fit into it but he also had the realisation that it really wasn't him when he pulled up alongside Keane, then in his final days at Manchester United, in traffic.
"I was playing for Liverpool and England, so I'm thinking, 'I've arrived', so the Megane can go for an Aston Martin," he said on BBC Radio's Afternoon Edition as part of promotion for his book 'How to Be a Footballer'.
"But I knew it wasn't me. Getting in it was a struggle, and I never felt right in it. But I pulled up alongside Roy Keane, with a bit of speed garage playing, the sunglasses on, window down, arm out.
"Then I looked at Roy and he looked at me, and you've seen Roy look at people in that way. He looked at me, and it's the smallest I've ever felt.
"It was a look of sheer disgust. I have to thank Roy, I don't even know if he knew it was me or some idiot stopped at the lights, but after he took off and left me in his wake I looked at myself in the mirror... and sold the car that week, and took a big hit on it. It wasn't me."
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