Ipswich Witches rider Cameron Heeps is to have his injured wrist x-rayed again in the hope of determining how much longer he will be out of action.
The 16-year-old Australian suffered a fractured scaphoid bone during a match against Plymouth almost a month ago.
The original prognosis was that he would be out for three to four weeks.
"It's a tiny bone, but it causes a lot of pain and you have to let it heal," Witches director of speedway Chris Louis told BBC Radio Suffolk.
"It's a small and soft bone and it doesn't have a good blood supply to it and that's the problem.
"If you don't have a blood supply to a bone it can take an awful long while to heal."
He continued: "It's a tricky one but he's having some more X-rays early next week and hopefully they'll show the bone is fixing and we'll see Cam back pretty soon."
Ipswich are seventh in the Premier League table, with only the top six qualifying for the end-of-season play-offs.
They beat Rye House last weekend, but now face a crucial home-and-away double-header against sixth-placed Edinburgh, with Stefan Nielsen continuing to deputise for Heeps.
"The lads went into that (Rye House) meeting knowing what we need for the rest of the season and that's basically maximum points from every meeting home and away and they made a great start.
"That was exactly what we needed and it's got to continue," said Louis.