The skipper limped off early in Tuesday’s 1-1 home draw against AFC Wimbledon with what appeared to be a hip flexor injury.
Norburn went for scans on the injury on Wednesday and Town expect to know the results today.
But the origin of the injury is not yet known. It is unclear whether the midfielder will be available for tomorrow’s visit of Fleetwood, and assistant boss Aaron Wilbraham admitted losing Norburn ‘even for one game’ is a blow.
He said: “Ollie had a scan on Wednesday and we’re still waiting on the results of that, so we can update you next time we speak.
“It’s a bit of a strange one, at first it was his hip, then there was talk of his quad or maybe his glute muscles.
“I don’t think it’s as serious as first thought, which is good news. I don’t think it will be a long period but we just have to wait for the radiologist to get back in touch and let us know exactly what it is.”
Wilbraham added: “It’s a massive blow to lose Ollie, even if it was just for one game. But we’ve got players to come in that department and the players that have come in have always done well.”
“As a squad we have to deal with those type of blows like we have with other areas.”
New signing David Davis made his full debut back at the club he enjoyed a loan spell at a decade ago on Tuesday night, initially starting as the attack-minded midfielder before filling in for Norburn alongside Josh Vela.
Town were, however, boosted on the injury front by the return to training of fellow midfielder Brad Walker.
The 24-year-old has spent more than three months out with an ankle injury sustained in Steve Cotterill’s first league game in charge on December 2.