Portsmouth are sweating on an injury to young defender Jack Whatmough.
The 17-year-old centre-half, who has made four appearances this season, limped off before half-time during Wednesday night's 3-0 Capital One Cup defeat by Stoke with an ankle injury.
Whatmough later left the Britannia Stadium on crutches and Pompey are waiting to find out the extent of the damage.
Boss Andy Awford said: " He hurt his ankle and so he's on crutches as a precaution. We'll know more when we have a proper look at him."