Meanwhile, Derry manager Damien Cassidy has rubbished reports that Kevin McGuckin has also quit the squad.
O'Gara, part of Ireland's struggling World Cup team, also rubbished rumours he has separated from his wife Jess.
Politicians rubbished frightened residents' claims that a large cat screamed and growled at them in the Neath Forest five years ago.
Haye rubbished Valuev's suggestions that he had spent the fight running away, adding that the 36-year-old "hadn't hurt me at any time".
Arcelor rubbished the quality of Mittal's steel and criticised its corporate governance.
At their party conference last month in Turin, the Democrats of the Left rubbished her proposals, especially those that would deregulate the market.
Those closest to the player rubbished the incident, pointing out that Wilshere is teetotal and has no track record of stepping out of line.
"Schemes like the Winter Fuel Payments, rubbished by Plaid at the time of introduction, have provided genuine support to pensioners in Wales, " he said.
The war of words flared as Royal Mail boss Adam Crozier rubbished the main postal workers' union's suggestion that the firm treats its staff as "slaves".
The committee last week rejected the argument that an accused could be tried in their absence from the outset, after senior legal figures rubbished the idea.
The critic in many ways resembles Marcel Reich-Ranicki, a Holocaust survivor who for many years hosted a television programme where some of Mr Walser's books have been rubbished.
Never mind that Number 10 speedily, and in brutal terms, rubbished what Mr Mandelson had said: the effect was as if the words had been Mr Blair's own.
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Curious, on the first of these, Michael Dell, on stage at Dell World in December, declared the PC alive and well and rubbished the idea of a post-PC era.
FORBES: So If The PC Is Dying, What Happens With Microsoft Next?
David Cameron has rubbished Mr Miliband's "one-nation" claims.
Mr Cable said Labour had "rubbished" the idea when it was in government but had now "simply copied it" in an attempt to "fill in their blank piece of paper where original policies should be".
He may soon face an embarrassing court appearance in a libel case brought by Sean McPhilemy, a journalist who claims his livelihood was threatened when the Sunday Times rubbished a television documentary he had made.
The Ipsos Mori poll, for the Richard Dawkins Foundation for Reason and Science, was rubbished by the Church, with Reverend Giles Fraser, former Canon Chancellor of St Paul's, saying it was not fair to trump people's "self-identification" as Christians.
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