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This is a position with a host of good candidates, none of whom have made a strong enough case to merit confidence in them touring as things stand.
Paul O'Connell, while still at the top of his game, is plagued by injuries. He has said himself that he is unlikely to tour, but cannot be ruled out just yet.
Donnacha Ryan has really put his hand up for selection since he burst into the Irish setup. On top of leading the Irish line-out, he thrives in the tight exchanges with his hard-hitting defence and strong running. He regularly plays on the blind-side flank for Munster, which is an added bonus.
Scotland's Richie Gray has the misfortune of playing for both a club and country that are struggling, but continues to shine. He offers too much to let this affect his selection.
Courtney Lawes burst onto the scene a few years back, but has been hit but both injuries and a loss of form. An in-form Lawes could be a star of the tour, but he'll need a big six months.
Mouritz Botha and Geoff Parling have been locking the English scrum in recent months, but would appear to be a level below the competition. Of the two, Parling would be the more likely tourist. He doesn't offer much in the loose but is a great line-out operator.
Joe Launchbury has just broken into the England team and is another potential "bolter." The step up to international rugby has not fazed him one bit. Like Ryan and Lawes, he is capable of playing covering blind side.
Wales have a host of players who could tour but they will need to cement their Welsh position before worrying about the Lions. Luke Charteris, Alun Wyn-Jones, Bradley Davies and Ian Evans will battle it out in the coming months for both the Welsh and Lions jerseys.
Charteris is the most likely tourist, but none of them can be ruled out just yet.
Probable Tourists: Lawes, Ryan, Gray, Charteris, Launchbury