The Cod Army endured patchy form following Alexander's December appointment in the wake of Micky Mellon's surprise sacking, eventually slumping to a 13th-place finish despite being in the play-off shake-up for much of the campaign.
Pilley concedes Alexander has plenty to learn but remains confident the former Scotland international can be a success on his first managerial assignment.
"I do think there's plenty to come from Graham Alexander - he's got a lot to offer," Pilley told the Blackpool Gazette.
"I think he has learned a lot since he was appointed. I think he was carrying more players than he would have liked and he's now going to get the chance to bring his own players in.
"When you get that chance it's up to you to make the impact that's required and be a real force next season."
He added: "I think a manager can only be judged once he has got his own players. Graham will have his own players eventually. It just takes a little time."