Sydney Swans sweat on Shane Mumford's availability for clash with Fremantle Swans ruckman Shane Mumford (right) is battling a groin injury and may miss Saturday night's clash with Fremantle. SYDNEY may be without key big man Shane Mumford again this week as the reigning premiers struggle to reignite their winning form. Soundly beaten in last Saturday's Grand Final replay against Hawthorn, the Swans meet 2012 finalists Fremantle at the SCG on Saturday night to continue a tough month, with Collingwood and Essendon to follow. The return of Mumford this Saturday night would give the Swans a significant advantage over the Dockers, who have a ruck division depleted through injury. Mumford was a late withdrawal against Hawthorn with groin soreness, and Swans coach John Longmire rates him only a 50-50 chance to play on Saturday night. "If he's right to play he'll definitely play," Longmire said. It's just whether he's had enough time this week to get right or not. The Swans will not be alone in their ruck concerns this weekend, with the Dockers also short on big men heading into Saturday night's match. Fremantle lost Jon Griffin to a season-ending knee injury against Collingwood on Saturday night after he had been carry the ruck in the long-term absence of the league's biggest player, Aaron Sandilands.