Luke Dowling and John Keeley have left Pompey.
Dowling, the Blues’ head of recritment, and goalkeeping coach Keeley are now expected to link up with former Pompey manager Michael Appleton at Blackburn Rovers.
Blues caretaker boss Guy Whittingham paid tribute to the duo for their work at Fratton Park.
He said: ‘Both have been excellent assets to the club. I totally understand them moving on and taking the opportunity.’
Meanwhile, Whittingham revealed he was hopeful of bringing in much-needed new players before this weekend’s trip to Scunthorpe.
‘I’m hopeful of getting two, possible three, in before Saturday,’ he said.