Pompey are unlikely to welcome any fresh faces before tomorrow’s clash with AFC Wimbledon.
Richie Barker is working on bringing in a loan signing but has so far been frustrated in his efforts.
The Blues boss said: ‘The chances of someone coming in are very slim.
‘To get the right person for the right finances to do the right job for us is not easy.
‘I can’t see anything happening before the weekend.
‘We’re working on a few. One is slightly more important than the other but we’re working on a few.
‘We know how we’re playing Saturday, so it’s too late for someone to come in and play at the weekend.
‘It’s frustrating but there’s still a long way to go yet. It’s ongoing.’