Sam Allardyce's decision to brand Louis van Gaal's team "long-ball United" has clearly riled the Manchester United manager. On Feb. 10th, Van Gaal pulled out a four-page pamphlet at a press conference that contained statistics and diagrams which supposedly disprove Allardyce's theory that United had to resort to lumping the ball forward to find an equalizer in the 1-1 draw at Upton Park the weekend prior. Here's a look at some other famous managerial spats which have been played out in front of the cameras.
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Rafael Benitez vs. Sir Alex Ferguson
Ferguson was famous for his mind-games and he clearly got under the skin of Benitez in January 2009 as United and Liverpool battled for the title. Benitez was unimpressed by Ferguson's criticism of referees and produced a sheet during a press conference listing a number of punishments handed down to the Scot by the FA on disciplinary issues. "These are the facts," Benitez said. If it was designed as a ploy to unsettle Ferguson, it did not work. United leapfrogged their rivals soon after and won the title.
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Kevin Keegan vs. Sir Alex Ferguson
Keegan was another manager who was riled by Ferguson. With Newcastle leading the charge for the 1995-96 title, Ferguson sparked a row with Keegan by claiming opposition teams tried harder to beat Manchester United than Newcastle. After hearing Ferguson's words, Keegan snapped back during a post-match interview. The Toon boss said: "I've kept really quiet, but I'll tell you something: he (Ferguson) went down in my estimation when he said that. I'll tell ya' - you can tell him now, he'll be watching - we're still fighting for this title. And I'll tell you honestly, I will love it if we beat them, love it." Keegan was left red-faced as United went on to win the title.
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Arsene Wenger vs. Jose Mourinho
Wenger's rivalry with Mourinho bubbled over again during the Portuguese's first year of his second spell at Stamford Bridge. The wounds that were opened during Mourinho's first stint with Chelsea looked to have healed when the 'Special One' and Wenger exchanged pleasantries early on in the season. But it took one small comment from Wenger to set Mourinho off again. With Chelsea leading Arsenal at the top of the table by just one point, Wenger said the Blues boss - and his counterparts - were playing down their title hopes because they "fear to fail". The following week Mourinho hit back in a press conference, describing Wenger as a "specialist in failure." Ouch.
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Brian Clough vs. Don Revie
To say there was no love lost between Clough and Revie would be an understatement. The pair loathed each other. So it came as no surprise that sparks flew during a gripping program called "Goodbye Mr Clough" on Calendar in 1974. Clough was hailed as a managerial genius after his success with Derby, but he was unable to work his magic at Leeds, where he was sacked after just 44 days. Revie, sat alongside Clough during the program, proceeded to criticize the former Forest boss for his failed reign at Elland Road and Clough gave as good as he got.