Greater Western Sydney may be forced to make up to four changes for Saturday night's pivotal Round 21 clash with Adelaide following a dirty day on the injury front on Sunday.

Veteran Brett Deledio spent most of the second half of the huge win over Carlton on the bench with ice applied to his left calf.

Meantime, Toby Greene has a hamstring problem, in-form ruckman Dawson Simpson faces at least a couple of weeks out after hurting his left ankle, while Sam Taylor also has a hamstring issue.