Factory Ducati rider Nicky Hayden battled numbness in his right hand on his way to ninth place in Sunday's Catalunya MotoGP.
“It was very difficult for me because I started having a problem with my hand going to sleep,” he explained. “I felt it a little bit in qualifying yesterday, so we did some treatment last night with the team physio, but the problem returned in the race.
“I've had it happen a couple of other times in my career, and around here, with so much hard braking, I could hardly feel the brake lever or the throttle. On the straightaway, I could move my fingers and get some feeling back, but then it would return.
“My pace was okay in the beginning, but after that group got away I really just tried to bring the bike home without crashing, since I couldn't feel how hard I was braking.
“Hopefully it won't come up in the tests, because I think we can make some improvements.”
This week's tests will take place at Catalunya (Monday) and then Aragon (Wednesday).