"They get a little taster of that but it's also hard when they go away sometimes. When they're travelling around, maybe they don't work as much as they might have done if they were just preparing normally like the lads who have stayed.
"One or two found it difficult to last the pace of the game [at Peterborough] which is a bit disappointing in pre-season and just shows maybe where their levels are at when playing against a Championship side - especially if they hope to play in the Premier League.
"We'll wait how it pans out and see who steps into the first-team squad and who goes out on loan. Then we'll see who we've got left to work with. We've got quite high numbers at the minute, which is unusual for me to have, and, until that sorts itself out, we're just looking to improve players."