Michael Appleton believes Erik Huseklepp’s departure could allow Pompey the breathing space to find a new owner.
But the Blues manager admitted he is unable to rule out more players following the Norwegian out of Fratton Park.
Appleton believes Huseklepp’s exit for Birmingham represented sensible business in the face of the club’s dire financial position.
The 36-year-old moved quickly to land Scott Allan on loan from West Brom, to fill the void created by the exit of the Blues’ top scorer.
He insisted the door is not shut on Huseklepp returning, with his deal at St Andrews running until the end of the season.
Birmingham will pay an additional fee for his services if they win promotion, with Pompey getting his £15,000-a-week wages off their bill.
Allan arrives from West Brom for an initial 28-day period, with the possibility of an extended stay.
The Blues will pay the Baggies a portion of his wages, whenever his stint with Appleton’s men comes to a close.
Appleton believes the move made sense on all sides.
He said: ‘It’s a situation where, from our view, it works with the financial situation we’re in.
‘It’s also a fantastic situation for Erik.
‘It was a decision that ultimately had to be made.
‘I’ve spoken to Erik two or three times since and he has loved his time here.
‘At the end of the day he’s doing the football club a huge favour by leaving on a short-term basis.
‘It may enable us to have more time to find an owner.
‘I don’t think the chapter is quite closed on Erik yet, though.
‘I had to act quickly and Scott Allan is a fantastic talent and a young lad.
‘He’s someone I was aware of at West Brom. I watched him a couple of times and they got him in January from Dundee United.
‘If we get rid of one player on x amount and bring in another on a hell of a lot less, it’s attractive from our financial situation.
‘We aren’t getting any kind of financial benefit.’
Appleton added: ‘You can’t rule it out (more players leaving) because the window shuts on March 22.
‘If people do leave I’ll have to try to use my contacts to get a player of the same standard or better – probably on about 25 per cent of the money!’