The traditional current raiser - the Valancia test - takes place Tuesday 18th.
The highly anticipated debut of WSBK Champion Toprak on #7 Pramac Yamaha will take place ,while Diego Moreira will make his debut #11 LCR Honda.
All Factory riders and test riders are expected to run ,the only exception being the injured Marc Marquez.
Nicola Bulega will take his place , while Alex Marquez will get his hands on a GP26 for the first time alongside Pecco and Diggia. Frankie* (Peccos bike) and Aldeguair will have GP25s.
Yamaha are expected to run the new V4 after Yamaha confirmed the end of the inline 4 engine.
TNT will have live coverage.
*Breaking news, Frankie Morbidelli fractured his left hand in the start line incident, #13 VR Academy rider Vietti will ride the bike today.