Mitrovic scored the winner from the spot for victory over Bournemouth on Saturday.
"It will be vitally important really, he's a top-class centre-forward and I think you've seen that evident in the last two games," said Parker.
"I know what the owners think, I know their ambition and certainly it is going to be to challenge.
"He's a top-drawer centre-forward but at the same time I think that this football club we'll be doing everything they can to keep a player like Alek.
"We've spoken about next year and the plans ahead and I think the main focus for Mitro is finishing the season like he has (on Saturday), a performance, the winning goal."
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