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Three over-age players are allowed to be selected, with Cahill donning a Millwall shirt for the first time in a competitive match since sealing a return to the club at which he made his professional debut.
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The 38 year-old Socceroos star wasted little time making in impact, sweeping home from close range to give his side a 2-1 lead.
Kyle Reid levelled for Coventry before Harry Donovan secured a late win for the visiting Lions.
