Douglas has been ousted as Celtic number one by David Marshall
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Celtic goalkeeper Rab Douglas is out of this weekend's Scottish Cup final.
Douglas had surgery on Monday on a thigh injury, an operation that was not due to be carried out until the end of the season.
He is expected to be able to join the rest of the squad for the pre-season tour of North America.
Meanwhile, John Hartson has resumed full training following a back injury but is unlikely to be involved in the cup final on Saturday.