Dan Lydiate, Wales
If Dan Lydiate's performances on the 2013 Lions tour weren't enough to warrant a recall, then his fine tackling form at this year's Six Nations certainly are.
As OptaJonny states, the Welsh blindside made 66 tackles in the tournament, failing to miss a single one. If there were any No. 6 whose name deserves to be first on the squad sheet, it's Lydiate's.
Justin Tipuric, Wales
Sam Warburton's dislocated shoulder means that he too will be absent from any plans Wales have for this summer, so it's fortunate that Justin Tipuric can come in as an asset of extremely similar quality.
The scavenging openside had to settle for a place behind his Welsh captain at the Six Nations, but took his chance well when he did get to feature, and he also has experience in the Lions teams, having travelled to Australia last year.
Chris Henry, Ireland
Any notion of Sean O'Brien's injury having a dramatic impact on Ireland's fortunes at this year's Six Nations were quickly swept under the rug by Chris Henry's surprising rise to prominence in Schmidt's setup.
The back rower not only filled in for his countryman, but thrived in his new responsibilities. That, on top of his considerable and consistent contributions to Ulster's cause are enough to warrant his inclusion.
Chris Robshaw, England
Having tragically been one of the most high-profile names to miss out on Gatland's touring squad last year, Chris Robshaw's hard work would be enough to see him included were there a plane to be boarded with the Lions this time around.
Robshaw's captaincy of England has gone well over the last two years, and the Harlequin is beginning to add more to his game than just tackling, pitching in with a more enthusiastic running game on occasion. Also has the added advantage of being able to play either side of the scrum.
Sean O'Brien, Ireland
Sky Sports reported this week that Sean O'Brien is "ahead of schedule" in his recovery for shoulder surgery, and could be back training in two weeks, which will be like sweet music to the ears of Leinster and Ireland.
On his day, the Tullow Tank ranks up there with some of the most devastating flankers in international rugby, and given a month or two to prepare, could be of definite use in a Lions tour this summer.
Billy Vunipola, England
Moving to the No. 8s, Billy Vunipola's ankle injury meant that he had to sit out the second half of the Six Nations, but it's not so serious that the Saracen is expected to miss out on a great deal of his summer.
Prior to that injury, the England international was in fine attacking form and, despite being just 21, had a huge impact against the likes of France and Scotland. With more time spent among more seasoned heads, there's no telling what Vunipola could go on to become.
Taulupe Faletau, Wales
Jostling alongside his cousin for the No. 8 jersey would be Vunipola's Welsh counterpart Taulupe Faletau, who beats Jamie Heaslip and David Denton to a place in our squad.
Heaslip may have started in three Australian Tests last year compared to Faletau's one, but when comparing the two players' respective development over the last year, it's the Welshman who should be given the experience, though a very tough call to make.