Brandon Haunstrup has undergone a minor arm operation.
But the Pompey defender will be available for the visit of Fleetwood on Saturday.
However, Danny Rose is an injury doubt.
The midfielder picked up a facial cut in training earlier this week, which required stitches.
Blues boss Kenny Jackett said: ‘We possibly have Danny Rose missing.
‘Also Haunstrup has had a minor operation on his arm but will be okay for Saturday.
‘In terms of the starting XI and the subs of last week, everyone else is fit and available.’
David Wheeler (ankle) and Andre Green (knee) continue their rehabilitation.