Can Oncu will move into the Puccetti Kawasaki WorldSSP seat that will be vacated by Lucas Mahias this weekend.
Mahias is remaining with the team but graduating to WorldSBK, so Oncu will partner Peter Ottl in the middleweight class.
“I’m really happy to join the Puccetti family in World Supersport," said Oncu.
"I can’t wait to test my new bike and start working with my new team, and I’ll be aiming for the best possible results, hopefully putting the experience I’ve gained this year to good use.
"I want to thank Kenan Sofuoglu, Manuel Puccetti and the Turkish Motorcycle Federation for allowing me to achieve what is a real dream for me.”