Aspar Ducati rider Eugene Laverty will undergo surgery on Friday after breaking his left radius in a testing crash at Jerez.
The 29-year-old Northern Irishman lost the front end of his Desmosedici GP14.2 machine and suffered a high-speed crash at Turn 7, also suffering a dislocated shoulder and a blow to the head.
As a result, he will now undergo surgery on his wrist at the Hospital Universitario Quiron Dexeus in Barcelona, with regular MotoGP surgeon Dr. Xavier Mir performing the operation.
"It's a disappointing end to a good day of testing," said Laverty, who made his MotoGP debut this year with the Aspar team riding an Open class Honda.
"We made good progress with the new electronics and the last exit before I crashed was probably the first time we had the bike working correctly.
"The lap times were getting better and then I crashed, so I'm disappointed.
"It would always be nice to do another day but the positive thing is that the bike is working well, we are not too far away from the others and Yonny [Hernandez] can continue to test tomorrow.
"Also the Ducati guys are making a big effort so the aim right now is to recover and return in Sepang in a good way."
Test ban to come into force
Friday is the third and final day of the private Jerez test, which is being attended by the factory Honda, Ducati and Aprilia teams as well as the Ducati customer teams - Pramac, Aspar and Avintia - and a number of World Superbike teams.
With a two-month testing ban coming into force at the end of November, it will be the last opportunity for the riders to test before the next official pre-season sessions at Sepang at the start of February.
Suzuki took the opportunity to test at Sepang earlier in the week, debuting its seamless shift gearbox that had been absent from its race bikes all year - a development Maverick Vinales described as "very positive."
Aleix Espargaro however was absent from the test, having fractured a vertebra in a training accident.
Yamaha meanwhile chose not to take the opportunity to perform any additional testing before the enforcement of the ban.