The midfielder's representative is adamant that his client was not considered for a spot in the England squad because he does not play for a traditionally big club
Britton, a product of the Lilleshall development school, represented the Swans at every stage of their climb up the English professional football ladder, eventually helping them gain promotion to the top-flight two years ago.
The 29-year-old went on to boast the highest pass completion rate in Europe in what was his and Swansea's maiden Premier League campaign and his representative says the midfielder was a key part of the Welsh side's success.
Glenn Cocoran told talkSPORT: “Anyone who has seen Swansea will see the role that Leon plays and see how instrumental he is to the way that Swansea played and the success that they achieved last season.
“Swansea aren’t the most fashionable side in the Premier League, they’re newcomers but they did a fantastic job and he had a great season.”
England’s midfield choices were depleted significantly in the build-up to the tournament by a string of high-profile injuries - most notably the withdrawals of Frank Lampard and Gareth Barry.
And Cocoran expressed disappointment that his client was not considered, remaining adamant that the sole reason for his omission is the fact that he does not play for a traditionally big club.
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“Obviously he wasn’t included in those, which then lent to the fact that Roy [Hodgson] would go with youth.
"You see some of the players that were included in the squad, and there were some young players but they weren’t used. So what difference did it make that Leon was 29?
“I just think it was more the reason that he wasn’t playing for one of the top six clubs.”