Sauber's head of track engineering Giampaolo Dall'Ara has left the Formula 1 team after over a decade with the Swiss squad.
The 47-year-old Italian is believed to be heading to the DTM with BMW, although the move has not been confirmed yet.
Dall'Ara will be replaced by Timothy Malyon, who had previously worked at Red Bull Racing as a race engineer.
"Giampaolo Dall'Ara has decided to leave our company after more than 15 years of service to pursue another challenge," a Sauber spokesperson told Motorsport.com.
"We would like to thank Giampaolo for his dedicated and highly valued collaboration over all these years. We wish him all the best for the future."