The 20-year old attacking midfielder was the subject of an official enquiry from the Gunners last month and it is expected that they will return in the summer but Heldt believes the promising talent will stay put in Gelsenkirchen.
"Of course, it was big money on offer, but still it was not enough for us.
"I am convinced Julian will be playing at Schalke past the end of the season. We are able to offer him enough ambition."
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