Central Coast Mariners and Adelaide United are both likely to be without key players for Wednesday night's FIFA Club World Championship qualifying semi-final at Gosford.

The A-League sides battled through extra-time games at the weekend and are still feeling the effects as they chase a spot in Sunday's final of the potentially lucrative tournament.

The Mariners are unlikely to have striker Stewart Petrie and attacking midfielder Tom Pondeljak, while United's captain Aurelio Vidmar definitely won't be playing and striker Chad Bugeja remains under an injury cloud.

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