Bolstering his chances even more is the news Andy Schleck has been invalided out of the race with a fractured hip.
The team will now most likely be asked to work for brother Frank instead as they seek a victory in the general classification.
Time trial specialist Fabian Cancellara will be a certainty for a place alongside Schleck and it is not hard to imagine Andreas Kloden, Yaroslav Popovych, Gregory Rast and Jens Voigt being at the start line. That scenario would leave Roulston vying with Jakob Fuglsang, Tony Gallopin, Linus Gerdemann, Markel Irizar, Maxime Monfort and Haimar Zubeldia for the remaining three slots.
Roulston's versatility could hold the key.
The fact team director Johan Bruyneel has sent him into the high mountains to train is a good sign. He can climb pretty well, can push hard at the front of the peloton and is superb in the team time trial.
He is the sort of rider who could get in a breakaway and contend for a stage win. The RadioShack team will be announced next week.
Where it gets really interesting is how it might affect Roulston's chances of making the London Games team. With just two spots available on the road and four riders - Roulston, Jack Bauer, Greg Henderson and Julian Dean - pressing hard, there are going to be some gutted athletes.
Completing the best part of 3000km in three weeks just before the Olympics will have those riders in supreme condition.
Nothing is set in stone at this point, but it would be logical to suggest that Roulston and Bauer, who is not a Tour contender for Garmin and is instead training with London in mind, are fighting for one place; the top-end speed merchants of Dean and Henderson, who will ride the Tour for Lotto, the other. While Roulston has the pedigree, Bauer's burgeoning ability in the time trial could be a selection swayer.
It goes without saying, however, that selection on to the Tour de France in one of the world's premier cycling teams would do Roulston's Olympic chances no harm.
