The 24-year-old already raced the Mercedes SLS AMG GT3 during the Navarra meeting of the FIA GT Series last year.
After three seasons with Hexis Racing Dutchman Stef Dusseldorp joins HTP Motorsport for 2014.
The German squad was a dominant force in the European GT scene last year, winning the Total 24 Hours of Spa, the Blancpain Endurance Series drivers’ title with Maximilian Buhk as well as claiming both Pro-Am and Gentlemen Trophy titles in the FIA GT Series in association with Gravity Charouz.
Stef Dusseldorp: “My two most important targets for 2014 were to be able to fight for wins and to drive as many races as possible. HTP Motorsport now gives me the opportunity to fulfil both wishes. It is an honour and a privilege to drive for the reigning champions.”