Nathan Thompson is suspended for the Blues’ weekend trip to Bradford City.
Pompey’s right-back collected his fifth booking of the season during Saturday’s 1-1 draw at Accrington Stanley, automatically earning a one-match ban.
It marked his first game back having missed the draw with Burton to attend the birth of his son.
On that occasion Anton Walkes deputised, and the former Spurs man is expected to once more come into Kenny Jackett’s side for Saturday’s Valley Parade encounter.
Thompson has made 53 appearances since becoming Jackett’s first signing as Pompey boss in June 2017.
While the 27-year-old is unavailable against Bradford, midfielder Tom Naylor will return after serving a one-match ban.