International Sports Management, the Cheshire-based agency which acts for cricket stars including Andrew Flintoff, Muttiah Muralitharan and Steve Harmison, along with top golfers Darren Clarke, Lee Westwood and Ernie Els, has secured a multi-million pound investment boost.

ISM has attracted funding from Leonard Ryan, and Mickey O’Rourke, founders of the broadcaster Setanta, their business partner Mark O’Meara and former US wrestling star Shane McMahon.

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