Paddy Ryder's return to the line-up will come complete with a new ruck partner in Tom Campbell, as St Kilda aims for its sixth straight win of the year up at Cairns' Cazalys Stadium.

The journeyman Campbell has spent 11 years in the AFL system between the Western Bulldogs and North Melbourne, with the 30-year-old signing with St Kilda as a delisted free agent in November of last year. Saturday night will be Campbell's 55th game at AFL level and his first in red, white and black.

Ryder and Campbell replace the injured Jack Hayes and Rowan Marshall, who battled through last week's win against GWS with a corked thigh.

Round 7 medical sub Jarrod Lienert has been named as an emergency alongside Tom Highmore, Ryan Byrnes and Mitch Owens.

St Kilda will face Port Adelaide on Saturday 30 April at Cazalys Stadium, Cairns, beginning at 7:50pm.

IN: Campbell (new), Ryder
OUT: Hayes (injured), Lienert (omitted), Marshall (injured)

Last week's medical sub: Lienert (replaced Hayes)