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Conor McGregor has pledged to take on Russian fighter Islam Makhachev when he returns from injuryUFC superstar Conor McGregor says he wasn't impressed by Islam Makhachev's performance in the cage last weekend and has vowed to take on the rising Russian star when he returns from the broken leg he suffered in his trilogy fight with Dustin Poirier last summer.Makhachev beat short-notice repl