Lewis Leigh, Josh Seary, Noah Mawene and Joe Rodwell-Grant have had game time in some of the friendlies to date.
North End head coach McAvoy was keen to have them involved in the senior squad, taking Leigh, Seary and Mawene to the Scottish training camp, together with young keeper Oliver Lombard.
McAvoy said: “We’ve seen some of the young lads in training and in matches.
“Noah picked up a bit of an injury at the weekend playing for the Under-19s against Middlesbrough.
“Lewis Leigh for me has done really well in the games.
“Maybe he struggled a wee bit in the Bolton game but I thought when he came on against Accrington he didn’t look out of place at all.
“I’ve been delighted with him, as I have been with the others.
“No matter what age you are, if you are good enough you are going to get a chance.”
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McAvoy said: “We’ve seen some of the young lads in training and in matches.