The Foxes go into the season on the back of winning the League One title in April and Britton knows they will be no pushovers.
He told the Swansea Evening Post: "It's going to be a tough start for us.
"They are going to be wanting to start well in front of their own fans and they will come at us at 100 miles an hour.
"When you play a team who have just come up they are always going to be full of confidence.
"We have had that momentum after winning promotion so we know exactly what's going to be like this weekend."