Henry Cameron left Bloomfield Road in an ambulance on Saturday and is a major doubt for Wednesday’s visit to Birmingham.
The winger fell to the ground unchallenged during the second half of the 3-1 defeat by Wigan and was taken straight to hospital for scans.
It was feared he had broken an ankle, but initial examinations pointed to ligament rather than bone damage.
With no-one around Cameron when he fell, it was suggested the 18-year-old tripped on the much-criticised Bloomfield Road turf.
Whatever the cause, manager Lee Clark is hoping for good news.
He said: “It’s too early to tell what’s wrong with young Henry. We have to wait for the swelling to come down before we can assess it. I just saw him go over.”
Cameron was making his sixth appearance since breaking into the first team just over a month ago and Clark added: “It’s a shame as he’s an exciting young player. He’s been one of the shining lights.”
The winger adds to Pool’s injury worries ahead of the visit to St Andrew’s.
Three players failed fitness tests on the morning on Saturday’s game, while Jamie O’Hara also limped off injured.
Clark explained: “Young Niall Maher failed a fitness test, and so did Andrea Orlandi and Jose Cubero.
“Jamie O’Hara managed to pass his. We didn’t think we’d have him.
“Mark Waddingon has had an operation and Tomasz Cywka is having one for a hernia.
“It’s mounting up for us now.”