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Jonny Wilkinson and England captain Chris Robshaw have not been named in the British and Irish Lions squad.
Head coach Warren Gatland named Sam Warburton as his captain in a squad that includes 15 Welshmen, 10 English, nine Irish and three Scots.
The squad will start the 10-match tour with a match against the Barbarians in Hong Kong on 1 June.
England skipper Chris Robshaw could become the country's third captain of the professional era to be overlooked for a Lions tour following Phil de Glanville (1997) and Steve Borthwick (2009).
With Wales' Sam Warburton pitched as the bookies' favourite for the British and Irish Lions captaincy, he may have seen off competition from Irish pair Paul O'Connell and Brian O'Driscol.
It is thought there will be few surprise selections, and none of the players will know about their Lions selection until tour manager Andy Irvine reads out the names during a mid-morning press conference.
The ten-match tour begins in Hong Kong against the Barbarians on June 1, followed by games in Australia, including three Test match appointments with the Wallabies.
More than a third of this summer's British and Irish Lions tour squad is expected to be provided by Wales.
The 38-man group for Australia will be unveiled today, with Sam Warburton the favourite for the Lions captaincy, aged 24, he could become Wales' youngest Lions tour captain.
Warburton has already led Wales to a World Cup semi-final in 2011, and a Six Nations title and Grand Slam last season.
At least 14 of his countrymen could join him, with Ireland likely to provide the second biggest number, followed by England and then Scotland.