Guy Whittingham is hopeful Liam Lawrence can win his fitness fight to line up against Forest.
The Blues’ skipper damaged his right ankle during the goalless draw with Crystal Palace in the week.
He has yet to return to training ahead of tomorrow’s Fratton clash.
However, Whittingham insists the midfielder is responding well to treatment.
And that is enough to provide belief he can feature in Steve Cotterill’s return.
He said: ‘Liam is okay. He came in and had treatment yesterday.
‘There is a bit of swelling there so the physios are hoping to keep that down.
‘Fingers-crossed he will be alright for us.
‘We will never write any player off.
‘What you want them to do is train on the Friday and see how they are.
‘We are hopeful we can do that with Liam.’
That is the only injury concern heading into a fixture with a side lying just one point above Pompey.
Greg Halford is definitely expected to feature tomorrow.
A shoulder injury sustained against Derby kept him out of the trip to Selhurst Park.
In his absence Aaron Mokoena filled in at right-back against Palace.
Halford will be back tomorrow, though, nudging Mokoena back to the bench.
While Benjani, who is now free from hamstring trouble, will by vying for a place among the substitutes.
Whittingham added: ‘Liam is the only injury we have got.
‘Greg was back in training yesterday.
‘He trained Monday and was fine – no problems whatsoever.
‘Then he felt a bit too sore on the Tuesday to risk it.
‘We will assess it today.
‘As for Benjani, he had only had one day of training before the Crystal Palace game.
‘He has had a couple more days now, so I think he is okay for tomorrow.’