Thilo Kehrer's anticipated move to Paris Saint-Germain remains subject to the agreement of personal terms, according to Schalke sporting director Christian Heidel.
The 21-year-old defender has been poised for a switch to the Ligue 1 champions since Schalke accepted a reported €37 million (£33m/$42m) offer.
PSG coach Thomas Tuchel stated earlier this week that he was unclear as to the stage of negotiations, which appear to still be in their infancy.
Kehrer, who made 28 Bundesliga appearances last season, had agreed a new contract with Schalke prior to PSG's approach.
"Kehrer's transfer to PSG is not yet complete," Heidel told reporters on Wednesday.