"When you're relegated you'll always be vulnerable to losing your best players. We will be no different," said Parker, who was named permanent boss last week.
"In saying that, the owners are committed to this team and have invested a lot of money into this team.
"I have no doubt they will be doing everything in their power to keep the best talent and best players so that gives us an opportunity next year.
"Of course I'd love Ryan Sessegnon to be at the club. Ryan fits into the bracket of a few others we want to keep. It's going to be a busy summer of rebuilding and us trying to keep hold of players.
"Harvey Elliot is definitely someone I believe in. In his 20 minutes against Newcastle you could see the talent he's got.
"He's a 16-year-old boy who is doing his GCSEs next week. He showed a lot of confidence."
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