With the implementation of the salary cap and 22-man squad sizes, the Blues must accept they are no longer in the market for Seddon.
The 22-year-old is contracted with Birmingham for another season, while this summer has seen Aitor Karanka appointed as the Championship club’s new manager.
Pompey themselves have handed Lee Brown a new two-year deal to ratify him as first-choice left-back in the campaign ahead.
And while Jackett continues to seek an alternative to bolster his full-back options, it won’t be Seddon.
He told The News: ‘We would need and do want a new left-back. We are working towards having two specialist left-backs for next season.
‘We haven’t got anyone else in the squad with the experience other than Lee.
‘Steve Seddon has obviously gone back and is a Birmingham player now.
‘I don’t know what the circumstances are with them, but there are a number of players we are working towards and considering.
‘By the start of the season, getting two specialist left-backs is something we will look to do.’
Seddon made 18 appearances after arriving on loan from Birmingham in January.
It was a Fratton Park spell which impressed the Pompey faithful – and Jackett.
He added: ‘I can’t speak for Birmingham, but we were very pleased with Steve, definitely.
‘He came in at a time when both our left-backs were out injured, so he helped us and showed a lot of quality.’
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