GP2 points leader Antonio Giovinazzi looks set to turn down an offer from Mercedes to join their successful young driver scheme.
The 22-year-old Italian has been in talks with Mercedes, with Auto Motor und Sport claiming that he has an offer on his table from the German manufacturer.
If Giovinazzi accepts the offer, he will be placed in DTM next year witha view at Formula One graduation in the future.
However, "He has not been in contact with us for three weeks now," Mercedes motorsport chief Wolff revealed, leading to doubts over whether Giovinazzi will indeed link up with Mercedes.
Mercedes have played a part in the junior careers of a number of F1 drivers, including Lewis Hamilton, Paul di Resta, Pascal Wehrlein, Esteban Ocon, and Michael Schumacher.
The 2015 European Formula Three runner up has also been conducting simulator work for Ferrari, although it is not thought that the Maranello squad have made an offer for his services.