Palace have no new injury worries ahead of the visit of Pompey.
The Eagles kept a fifth clean sheet in a row when they drew 0-0 with Reading on Saturday so boss Dougie Freedman will not make major changes.
However, Darren Ambrose started on the bench after suffering a slight leg knock against Southampton last week so he will be pushing to return to the starting line-up.
Defender Alexander Tunchev and midfielder Owen Garvan are also hoping to return to the squad having built up their fitness following recent injury lay-offs.
Full-back Lee Hills is still missing with a long-term knee problem and midfielder Alex Marrow is not yet ready to return from an ankle injury.
Portsmouth defender Greg Halford could miss the trip to south-east London.
Halford had to go off with a shoulder injury during the first half of Saturday's 3-1 defeat at Derby and was replaced by Joel Ward at right-back.
Teenage midfielder Abdul Razak is pushing for a place in the starting line-up after his encouraging debut as a substitute at Pride Park following his loan switch from Manchester City late last week.
Striker Benjani will be checked over after missing the last two matches with a hamstring injury and defender Hermann Hreidarsson is still out following a recurrence of his Achilles problem.
Midfielder Hayden Mullins returns to face the club he made more than 250 appearances for at the start of his career.