Movistar Yamaha's Maverick Vinales is sitting out today's Brno MotoGP test after damaging his shoulder in yesterday's turn three crash.
Vinales went down in a tangle with Bradley Smith and Stefan Bradl on lap one - and the HRC test rider is also out of action and is being replaced by Hiro Aoyama.
It leaves Valentino Rossi as the sole works Yamaha pilot to try a new batch of electronic strategies in the Czech Republic.