Chris Walker has undergone a second operation to re-pin his broken left leg and ankle.
Walker, injured during the Mettet supermoto race in Belgium last month, is battling to be fit in time for his debut with new team GSE Racing on December 7 at Valencia.
Walker said: " When I had the crash, the medical team in Belgium suggested that I should have what was a relatively simple operation so that I could travel home in relative comfort " .
" They pinned my ankle and inserted a plate with two screws into my leg. It felt comfortable, but I decided to see my regular doctor for a second opinion when I returned home.
" Unfortunately, the screws had come slightly adrift and he recommended that the best thing to do would be to have a stronger plate fitted. That operation has been carried out now and the restriction on my ankle won’t be too severe. "
Walker hopes to complete the test alongside teammate James Toseland before returning to hospital to have one of the screws removed.