Six Nations: Lions tour places up for grabs in Wales and England showdown, says Warren Gatland So there shouldn't be any lack of motivation. I know if I was playing I would be saying I would be thinking: "I have a chance to get myself on the plane. I am not leaving anything in the tank. I couldn't have asked for anything more than that but that's not forgetting that Scotland and Ireland have big games as well. There is a lot at stake for players in those two teams to perform in the last weekend too. The Lions head coach admits he has also to finalise his tour captain from a shortlist of "three to four" candidates and, to add further intrigue, Gatland conceded that this weekend could further narrow the search before he names his captain and squad on April 30. That is likely to heighten the interest in the head-to-head battle on Saturday between England captain Chris Robshaw and Sam Warburton. Robshaw, Warburton and Ireland centre Brian O'Driscoll are thought be among those under strong consideration to lead the Lions. "I think there are three or four individuals that people have been consistently been talking about and again I think this weekend may answer one or two of those questions," Gatland added. We will pick the squad first and then look at a captain. When you are looking at a captain and leadership, there are a number of things in terms of how the player sets an example on and off the field in terms of discipline but also how he carries himself and the respect he earns from his fellow team-mates. Yet after three selection meetings with his fellow Lions coaching team of England pair Andy Farrell and Graham Rowntree, Gatland says only 23 of 37 potential places have been filled. "I would say consistently there has been 22 or 23 that have been on that list so I would say there is still around a third of the squad up for grabs," added Gatland, who will also consider players such as Ireland lock Paul O'Connell, wing Simon Zebo and Wales flanker Dan Lydiate who have missed Six Nations action because of injury if they prove their fitness next month. But he says that any team who win a Grand Slam "deservedly and rightly" can expect there to be a large contingent from their side in the Lions squad, a further carrot for Lancaster's side on Saturday. "There is a real air of humility around that team at the moment and that's good for English rugby and the game," Gatland said. Stuart and the other coaches have done a really good job in terms of keeping them grounded and not getting too far ahead of themselves. It is hard to do that sometimes. That is why there are a lot of things about this weekend that you may get a few answers on some positional match-ups. It is perfect for me to see how players from both sides respond to that pressure. The Wales squad, having recovered from the opening day defeat by Ireland with victories over France, Italy and Scotland, also have much to prove to the Lions coach however. With no Welsh sides in the knockout stages of the Heineken or Amlin Challenge Cups next month, Saturday is likely to be the last opportunity for some of Rob Howley's squad to convince Gatland they should make the tour. "Wales will be thinking the points difference isn't massive so there is an opportunity there at home," Gatland added. They know they played poorly in the first half against Ireland and it has potentially cost them the chance of repeating the Grand Slam. Now they have come out of a bit of a dip, got themselves back on track and really have fought hard and probably still think there is something still in it for them to play for. "From the outside, if you were a Welsh player you would be massively motivated into thinking, "If I go out there and beat England, I have got a chance of getting myself on the plane."" Warren Gatland was talking on behalf of Land Rover, for your chance to Lead the Lions in Australia visit www.landrover.co.uk/rugbyprizedraw