Local pair Jordan Lyttle and Marcio Soares return to the Ports after spells with the Crues
Eoin Bradley is returning to former club Coleraine after leaving Glenavon.
The thirty-three year-old joined the Lurgan Blues in the 2014/15 season.
He scored 40 goals in 91 appearances, and was a member of the victorious Irish Cup winning squad.
Meanwhile, Portadown boss Niall Currie has added Jordan Lyttle and Marcio Soares to his squad.
The local pair return to the club after a short spell with league champions Crusaders.
28-year-old midfielder Shea McGerrigan has joined from Armagh City.
Elsewhere, Ballymena have announced defender Kyle McVey has joined Carrick Rangers on loan until the end of the season.
Dungannon Swifts have completed the signing of forward Tommy Lockhart from Rathfriland Rangers Football Club.