Pompey’s desire to sign Marko Futacs impacted on any potential long-term stay for Christian Dailly.
Dailly, who impressed Steve Cotterill, left Fratton Park last week at the end of his one-month deal.
The Blues boss would have loved to have kept the veteran defender but the need to balance the books dictated the Scot had to go.
Instead, Dailly’s freed-up wages went towards tying Hungarian striker Futacs to a one-year deal.
Cotterill said: ‘Christian played an important part in the month he was here. Had we had an unlimited budget, he would have been fantastic around the place for much longer.
‘But we took a young striker in Marko Futacs, who we could get for free at the time.
‘It was about balancing the books and trying to use the wages of Christian to do that to get Marko in.’