Both Ben White and Emile Smith Rowe missed out from the England squad.
The Three Lions will be playing Albania on 12 November at the Wembley Stadium to book their place in Qatar 2022.
Many expected Smith Rowe to get selected in the England squad and his call for the senior team goes on.
“I think Emile, Conor Gallagher and Marc Guehi, in particular, are all playing very well with their clubs but we’ve got depth,” the England manager told reporters.
“To put those in, we’ve got to leave some of those on the sheet out. I think it’s not a bad thing that we’re starting to get a very strong under-21 team because you want that depth. We fast-tracked lots of young players quickly and the majority of them are still in this squad now. A lot of them played a big part in the Euros.
“We’ve also had some come up and then when you put them back with the under-21s it’s a lot more complicated so we want to get the timing of that right.
“The boys I’ve just mentioned are on a really good path, we like them, we get to see them with the under-21s as well as their clubs.
“At the moment, we think it’s a little early for some of those guys to come in, we could put them in and they would be absolutely fine by the way, but we think the players we’ve picked are just a little bit ahead at the moment.”
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