Goal.com rounds up the former skipper's most forthright quotes following his latest outburst which came in the wake of Andre Villas-Boas' sacking from Chelseaear-flicking antics during the warm up for the Blues' FA Cup win over Birmingham following the sacking of manager Andre Villas-Boas.
Whether it is slamming his own fans, managers, team-mates or players Keane has always delivered great soundbites. Here are five of his finest.
|The quote that got him sent home
"I didn't rate you as a player, I don't rate you as a manager, and I don't rate you as a person.The only reason I have any dealings with you is that somehow you are the manager of my country"
Admittedly this is the slightly toned down version of Roy's infamous rant at then Ireland boss Mick McCarthy. Ireland's captain was sent home from a pre-World Cup 2002 training camp in Saipan and even a decade later the incident provokes fierce debate on the emerald isle.
|The quote that ended his Manchester United career
"Just because you are paid £120,000-a-week and play well for 20 minutes against Tottenham, you think you are a superstar"
This verbal bomb was aimed in the direction of Rio Ferdinand in a toxic interview with MUTV in 2005 which ultimately led to Keane's departure from Manchester United. The interview has never been broadcast.
|The quote that launched 'prawn sandwich' brigade
"Some people come to Old Trafford and can't spell football, let alone understand it. They have a few drinks and a prawn sandwich but don't realise what's happening on the pitch"
Corporate fans attracted Keane's ire following a number of quiet games in 2000 at Old Trafford. Sales of prawn sandwiches have never recovered.
|The quote that led to a playing ban
"I'd waited long enough. I f***ing hit him hard. The ball was there (I think). Take that you c***"
Keane's autobiography in 2002 was a national bestseller but his quotes on his infamous tackle on Alf Inge Haaland in the Manchester derby led to a playing suspension. Subsequent versions of the book have removed the quote.
|The quote which may come back to haunt him
"I was asked by ITV to do the Celtic versus Manchester United game but I've done it once for Sky and never again. I'd rather go to the dentist. My advice to anyone is don't listen to the experts, just watch the game and gather your own opinions"
Keane dabbled with punditry following his retirement from playing in 2006. Since his dismissal from Ipswich Town in early 2011 he has softened his stance and is now a regular analyst for ITV.