Pompey boss Richie Barker has admitted Simon Ferry’s body can cope with only two matches in a row at the moment.
But the club are looking at a ‘couple’ of treatments to solve his ongoing injury problems.
The midfielder’s campaign has been blighted by injuries, culminating in him limping out of the match with Mansfield in the 50th minute on Saturday.
Following a scan, the problem has been pinpointed as stemming from his back.
Ferry hasn’t played three matches on the trot since September, emphasising the problem he is continuing to endure.
He has been ruled out of this weekend’s trip to Morecambe following the latest setback.
And for Barker it is a case of managing the complaint as they explore the possibility of other routes.
He said: ‘Simon is pretty much the same as he was the last time he dropped out, which is fairly sore for a week or so.
‘We half-knew that was going to be the case.
‘It was going to be two or two-and-a-half games at a time and we are without him again.
‘We were considering bringing him off at half-time (against Mansfield) and had a fair idea he wasn’t going to make it through the game.
‘We thought we could get 10, 15 or 25 minutes out of him but it became pretty clear straight away that it wasn’t going to be the case.
‘We needed to see what we could get out of him and he could have gone back out and loosened up again – and to be fair to him he wanted to give it a go.
‘After two or three weeks he starts to get better. Will he get any better three or four weeks down the line? I don’t know. There are a couple of aspects of treatment we are reviewing at the minute and having a look at.
‘If we decide one of them may help solve it then it might be worth a go.
‘The physio tried to explain it to me yesterday morning but after about 15 seconds he lost me!
‘It’s some kind of nerve problem running from his back, though.
‘I don’t think there is actually a hamstring problem, it’s a back problem causing something in his hamstring.
‘At least we have a bit more cover than we did a few weeks ago, with Nicky (Shorey) coming in. So we have got options.’
Thery Racon is expected to replace Ferry in the starting line-up at the Globe Arena.
There may also be a return to the squad for fellow midfielder Romain Padovani, who didn’t make the match-day 18 against the Stags.