The Ospreys captain knows he faces a battle to earn a place in Gatland's starting XV, with Ireland's Paul O'Connell, Scotland's Richie Gray, England's Geoff Parling and fellow Welsh international Ian Evans all fighting it out for the number four and five shirts.
"Paul O'Connell, Ian Evans, Geoff Parling and Richie Gray have been the four stand-out locks in British and Irish rugby over the past two years," the 27-year-old told the South Wales Evening Post.
"So the competition will be huge for Test places. What you have to do is get the best out of yourself.
"All of them are very good players. Paul O'Connell led the Lions last time and deserves all the accolades. I think having people like him and Brian O'Driscoll around will be great for Sam (Warburton) as captain, because they have such experience.
"The main thing for me is to go out to Australia, do myself justice and do well for the squad."