England manager Roy Hodgson insists the door is still open to anyone who wants to force their way into his squad, but they must prove their worth domestically.
Hodgson has presided over the Three Lions for almost four years and has taken the opportunity to call up a number of uncapped players.
England boast a 100 per cent record in Euro 2016 qualifying and look well on course to be in France next summer.
However, currently Hodgson is running the rule on the England under-21 squad in the Czech Republic as he looks to see who could force a way into the senior side.
The Young Lions are turning out at the under-21 European Championships and fell to defeat in their opening group game against Portugal, who are priced at 1.53 to win Group B.
Five members of Gareth Southgate’s squad already have senior international experience, while six other regulars in Hodgson’s side are still eligible for the 21’s.
The former Liverpool and West Brom boss insists it is up to the under-21s squad to prove a point and look to tie down a spot with the senior side over the next 12 months.
Hodgson said: “I think it’s up to them. I can’t give you names, it’s up to them. Obviously we know them all already.
“I have been following them all for the last couple of years.
“I would like to think that with the [senior] squad I have it will make it a little bit difficult for them to break in because there are only a certain number of players – it’s absolutely down to them.”