Pata Yamaha's Alex Lowes could be forced to sit out of his home round at Donington Park this weekend due to injury unless he passes a fitness review with the World Superbike medical staff at the end of FP1.
The Crescent Racing-run Yamaha squad is already without Sylvain Guintoli, who is still recovering from a broken right ankle sustained in a high-side off during qualifying at Imola and will be replaced by Cameron Beaubier at Donington, and the team will have to wait until after the opening free practice to get the green light for Lowes to compete at his home event.
The British rider suffered a fractured left collarbone in a fall during the wet race two at Sepang two weeks ago and after flying home underwent surgery.
Lowes is already expecting to be racing through the pain at the Leicestershire circuit but will need to pass a fitness test set by the World Superbike medical team at the end of FP1 if he is to be signed off to take part in the races this weekend.
World Supersport rider Glenn Scott, who competes for Lorini Honda, will also undergo a fitness test at the end of the opening free practice session to confirm whether or not he has recovered sufficiently from his double leg fracture which has ruled him out of the past four rounds.
The Australian suffered the injury in a nasty crash during the first free practice session at Aragon in early April and duly underwent an operation in Barcelona which automatically ruled him out of the Spanish round plus Assen and Imola.
As a precaution Scott also missed the flyaway to Sepang and is targeting a comeback this weekend at Donington.