Pompey are waiting to learn the full extent of Bradley Tarbuck’s ankle injury.
The teenager limped out of last night’s 2-0 victory at Thurrock in the Blues’ latest pre-season fixture.
He lasted just seven minutes having come on as a second-half substitute and left the ground on crutches.
Andy Awford’s medical staff will assess the damage to his right ankle over the next few days.
But Emsworth-born Tarbuck could well be sent home from their Five Lakes training base for treatment.
Awford said: ‘I don’t know yet what the situation is with Bradley’s injury.
‘Obviously he has rolled his ankle. As soon as you see it you want to get him off because you don’t want to make it any worse than it is.
‘We will assess it in the next couple of days once the swelling has gone down. Will he stay? I don’t know.
‘So we will see how bad it is and decide whether there is any point in him being here if he can’t train.
‘We will assess that tomorrow and Friday and have a look at it.
‘He left on crutches last night and I don’t want him to fight his way through it and make it any worse.’
It is a massive blow to Tarbuck, who netted in the 6-1 win over Bognor at the weekend.
The first-year professional has joined Ben Close, Nick Awford, Jack Maloney and Alex Bass in featuring so far during pre-season.
Awford has opted to give them all precious first-team experience in the opening three games and they once again will turn out against Ebbsfleet on Saturday.
Tarbuck has impressed in parts with his attacking impetus and pace, putting himself in the situation where he could have got a hat-trick at Nyewood Lane.
And Awford has been impressed with all the youngsters on show.
He added: ‘They’ve done well. I’ve been impressed with them all. They’ve done what has been asked of them.
‘You want to get the young lads involved and they haven’t let anyone down.
‘They’ve pleased me.’