Pompey have signed Stanley Aborah until the end of the season.
The midfielder is a free agent after leaving Notts County by mutual consent on transfer deadline day.
The 29-year-old made 11 appearances for the Magpies this season, yet new boss Kevin Nolan opted for a parting of the ways.
Aborah has often impressed against Paul Cook’s side, totalling 42 appearances and one goal during his Meadow Lane career.
His last outing was as a substitute in the January 21 defeat at Grimsby.