But sources close to the deal have informed us that any unveiling has been put back to allow the 23-year-old to concentrate on a family matter.
Dale will now not make his Blues debut in Saturday’s Fratton Park fixture against Lincoln – Pompey’s first home game of the new season.
Although yet to be officially confirmed by the club, the 23-year-old’s arrival takes Pompey’s recruitment drive for the summer up to 10.
Earlier today, Tangerines boss Michael Appleton said he would not stand in the way of certain players on the fringes of things at Bloomfield Road from departing – including Dale.
The Blues’ next game after the visit of the Imps is against Cardiff in the Carabao Cup on Tuesday night.