Leicester Lions are waiting for news on the extent of a shoulder injury suffered by Ilya Bondarenko at Newcastle on Sunday.
Russian rider Bondarenko was hurt in heat 10 of the club's 50-40 defeat in the North East.
Promoter David Hemsley said: "We're awaiting the results of a CT scan and we're having a specialist look at him on Saturday, so we'll have to see.
"It's disappointing because his scores and riding have been very encouraging."
Leicester beat Newcastle on at home on Saturday night but lost the return meeting in Newcastle the following day.
The Lions lost their opening Premier League fixture against Scunthorpe the previous week.