PORT Adelaide recruit Jack Lukosius has suffered a fresh setback but the Power expect at least four other players to soon be cleared from their injury list.

Lukosius, who Port secured from Gold Coast in last year's Trade Period, sustained a fractured kneecap against Richmond in round two.

But just as the 24-year-old was completing his recovery, Lukosius has reported a back issue which will sideline him another two to three weeks.

Lukosius' absence comes as the Power, struggling in 15th spot on the ladder, expect a batch of players to be available for Saturday night's clash against Greater Western Sydney in Canberra.

Darcy Byrne-Jones has overcome the concussion which sidelined him from Port's last game and will return to training on Wednesday while defenders Kane Farrell, Josh Sinn and Esava Ratugolea trained fully last weekend.

Farrell, who has been missing since round 10 because of a knee injury, Sinn (hip) and Ratugolea (hamstring) are tipped to pass fitness tests this week and be available for selection.

But midfielder Jason Horne-Francis will miss a second consecutive game because of a hamstring strain, with the Power expecting him to return in round 14.