Michael Drennan will today discover whether his international call-up has cost him his Pompey place.
The on-loan striker was unavailable for Blues duty against Chesterfield after being named in the Republic of Ireland under-21 squad.
Drennan subsequently made a 15-minute cameo as a substitute in the 2-1 Dublin defeat to Montenegro.
In his club absence, Barker opted to field a lone striker in the goalless draw against the League Two leaders on Monday.
The previous match, Drennan had lined-up in attack alongside Jake Jervis in the 1-0 win over Accrington.
Now the 20-year-old is back at Fratton Park and will be in the match-day 18 to face Cheltenham tomorrow.
But the front man will learn today whether he will be in the starting line-up or forced to make do with a place on the bench.
‘When I made my full debut for Portsmouth against Accrington, I felt my movement was off a bit, not quite there,’ said Drennan.
‘But I like to think I had probably done enough to keep my place for the next match.
‘That wasn’t to be, anyway, because I was on international duty. But I’m available now.
‘It’s just whether the gaffer thought I did okay and decides to bring me back into the side against Cheltenham tomorrow.
‘I watched a bit of Monday’s match on tele and then followed it on Twitter.
‘I will find out today if I am back in the side. I won’t really complain if I’m not because the lads did so well.
‘You can’t turn down your country, though.
‘I asked about playing on Monday night and then travelling back over to Dublin on the Tuesday, especially if I wasn’t starting for the under-21s.
‘But there was no chance.
‘We lost 2-1 to Montenegro but should have won – we were 1-0 up and should have been 3-0 up at half-time. Then they came out and scored two goals in the first five minutes.
‘I came on for the last 15 minutes, but was just happy to get the call-up and be in the squad.’
Also missing against Chesterfield was Daniel Alfei, who had Wales under-21 duty against England. However, on the night, the on-loan Swansea right-back did not make the squad.
His Pompey place was taken by Joe Devera, who impressed in his first match back after injury.
Up until that point, Alfei had made nine successive starts with Pompey and had his initial one-month loan extended until the end of the season.
Injured pair Danny East and Simon Ferry are definitely out of tomorrow’s fixture.