Davies - who made 15 Guinness PRO12 appearances for Scarlets this season - will be battling to stay in the squad when it is cut to 12 players in July.
Davies has captained Wales Sevens before and appeared in the 2014 Commonwealth Games in Glasgow.
"To get on that final plane (to Rio) is going to be very difficult," he said.
"It's going to be a tough seven weeks, to try and get yourself in that last 12 is a tough task.
"At the end of the day it's a challenge and I'm quite looking forward to it."
"At the Commonwealth Games it was an honour to represent Wales but to represent Great Britain at the highest level possible, that's a very exciting prospect.
"My focus is completely on giving it all for those training weeks and giving myself every opportunity to ensure I'm on that plane.
"It's obviously going to be quite tough. In the past when I've played sevens I was playing 15s at the same time, I was going back and forth so I'm quite comfortable I'll be able to do it."
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Guinness PRO12 Scarlets News
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