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.”
We have gathered the best of recent Championship transfer speculation below.
1. Former defender set to take the reins at Swansea City
Russell Martin could be set to take over as manager of Swansea City after becoming frontrunner ahead of Jody Morris. Martin led MK Dons to a 13th place finish in League One last season. (Eastern Daily Press)
Photo: Pete Norton
2. Stoke City striker set for League One move after O'Neill confirms interest
Wycombe Wanderers are reportedly in talks to sign Sam Vokes from Stoke this summer. The striker has dropped down the pecking order after failing to score in 30 league appearances. (Football Insider)
Photo: Michael Regan
3. Former Arsenal midfielder tips John Terry for Championship job
Ray Parlour has tipped John Terry to succeed in the dugout after the former defender was linked to a move to the Championship. Parlour has warned Terry not to take on too much like Frank Lampard. (MIrror)
Photo: Naomi Baker
4. Fulham open to letting French winger leave after big money signing
Fulham are open to letting Anthony Knockaert leave the club after signing Harry Wilson froom Liverpool. The Welshman’s arrival opens the door to possible departures. (Football League World)