Callum Johnson has joined fellow League One side Fleetwood on a season-long loan deal.
The 24-year-old right-back has played 48 times for Pompey since arriving from Accrington last September.
He has featured twice this term, including a late cameo appearance at Highbury Stadium on the opening day.
Johnson has recently returned from a three-match ban after being controversially sent off against Millwall in the Carabao Cup.