"I probably could play on, but this year, on the first day of pre-season, I did my calf in the warm-up".
While the Swans are not mathematically relegated, the only way they can stay up is if they beat Stoke, Saints lose to Manchester City and there is a 10-goal swing in goal difference between the two clubs.
Southampton - who many humour as Liverpool's second team - need to avoid defeat against Manchester City to retain their English Premier League status for another season.
Britton has made four Premier League appearances this season and since the arrival of manager Carlos Carvalhal in December has featured just once, in an FA Cup win over Sheffield Wednesday.
Swans manager Carlos Carvalhal insists his side will do its part to deliver victory in front of the home fans on the season's final day.
"There is a little bit of a cushion but we are playing Man City and we have to be careful". Not because the chairman did not do the maximum and not because the investors did not do the maximum, but the reality was that players didn't want to come to Swansea because we were last in the table and nobody believed we could jump positions.
"It's been incredible to see how he's stepped in on the first day to try and change things around, trying to be positive and trying to make us better".
Speaking to The Ref Show, the former Owls midfielder said of Carvalhal, who is now expected to be relieved of his duties after Sunday's season finale against Stoke: "He's had a tremendous start". "It was very hard for us to get players".
Swansea have scored less goals than any other team in the league at just 27 meaning a big return like that isn't hugely likely - something which works in Southampton's favour. If we can win with goals then that's better and better. We must analyse the whole season with all the games.
The Saints have a much better goal difference than many of those around them at -18, meaning there is a now a nine-goal swing between them and the Swans who sit on -27.
"You're going to go back down to the Championship - it's a big, big shame for the football club after seven years in the Premier League".
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