Port uncertain on fitness of Gray, Jonas

Port Adelaide co-captain Tom Jonas faces further fitness on an injured calf after missing the past four AFL games because of the injury.

Port Adelaide remain uncertain if injured stars Robbie Gray and Tom Jonas will return for a road stretch that could define their AFL season.

Co-captain Jonas (calf) has missed the past four games and Gray (broken hand) the last three, with the pair to face fitness tests later this week.

The eighth-placed Power meet Hawthorn in Tasmania on Saturday followed by clashes against St Kilda in China, a bye and a trip to Perth to play Fremantle.