Cameron Woodward is expected to miss the next four weeks of Eastbourne Eagles' season after a dramatic smash at Wolverhampton on Monday.
The Australian reserve has been told fears he broke an ankle in the collision with Frederik Lindgren are unfounded but X-rays have revealed a chip or crack to the bone.
Woodward also has a broken collar bone which is considered a fairly routine injury in the tough world of speedway.
Eagles will be without both reserves for Saturday's home meeting with Coventry, whatever the condition of Stefan Andersson.
The Swede, who was undergoing treatment on a groin injury yesterday, has been ordered by his national governing body to race in a world championship qualifier on Saturday.
Eagles have again put Edward Kennet on standby to guest and are checking on the fitness of David Norris, who went to the gym yesterday, and Dean Barker, who could ride in a brace.
Team boss Trevor Geer said "I'm really hopeful one or both of David and Deano will be fit.
"With Cameron we are looking at three or four weeks out. I'm looking around the Elite League to see who I can bring in to replace him.
"It will be difficult because he is worth a few points around Eastbourne."
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