Promoter Dave Tattum describes the current injury crisis at Stoke Potters as a "nightmare" for him to deal with.
Gareth Isherwood broke two vertabrae in his back at Mildenhall on Sunday, while Tim Webster (hand) and Tony Atkin (knee) also have injury problems.
"Times are difficult at the moment because we don't know how long the injuries are going to take to heal," Tattum told BBC Radio Stoke.
"Should our riders not be fit, it's going to be an absolute nightmare."
He continued: "I'm sure we'll be able to replace Gareth, we're allowed to do that in the rules and regulations, but it's a very difficult time for us.
"We've gone all through the season relatively injury-free and we've copped it all within two weeks."
Stoke were beaten 97-84 on aggregate by Mildenhall in the National League play-off semi-finals.
The Potters compete in a challenge match against Birmingham on Saturday and have until 22 October to prepare their team for the second leg of their Knockout Cup final, also against Mildenhall, at Loomer Road.