The Munster second row is in an impressive run of form and continues to grow as a player.
With enforcer Paul O'Connell a major doubt for the whole tournament, O'Callaghan is showing he has the right qualities to galvanise the Irish pack.
O'Callaghan was peerless against Wasps on Saturday, making a complete mess of the opposition line-out and wrecking the English team's hopes of establishing a platform. Totally deserved his man-of-the-match award.
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