Ronny Deila says a clean sheet could be crucial to their Champions League progress after Dedryck Boyata's late header gave Celtic a narrow 1-0 win over Qarabag at Parkhead.
Ronny Deila says a clean sheet could be crucial to their Champions League progress after Dedryck Boyata's late header gave Celtic a narrow 1-0 win over Qarabag at Parkhead.
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