The Swans are into Europe for the first time.
Britton said: "It can be tough. When you look at the teams who were in the Europa League last year they struggled a little bit in the Premier League - and maybe that was because of the number of games.
"But we'll be looking forward to it. A lot of us haven't played in Europe before so it will be great for us as a club.
"But the bread and butter is the Premier League and we need to make sure we stay there.
"We need to enjoy the Europa League and enjoy the experience, but staying in the Premier League is still the goal."