The youngster is highly rated across Europe, and Arsenal were linked with a massive move in the January window.
But nothing materialized, and now Bayern are pushing to get to the head of the queue for his signature.
"I do not know the player enough," Heynckes admitted to Sport Bild.
"But he's certainly in the focus of our scouting department, like many other players as well. [Sporting director] Hasan Salihamidzic has very clear ideas and is driving forward the plans for next season.
"He knows exactly who is in our sights and which players he would like to have. He has high quality players in mind."