Parker is convinced his already-prolific Serbian striker will only get better now he is back among the elite.
He declared: “As a player and person, there's still so much growth in there for someone so young - even if people don't see him like that.
“When he's as good as he is now, it's scary how much improvement I can still see in him - where he can get to and how much better he can be.
“I'm looking forward to seeing what he's got this year. It's a big challenge - he puts that on himself really - but I have no doubt he'll do well."
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