Chants of 'sack the board' were heard from the home supporters during Celtic's goalless draw with Kairat Almaty in Champions League qualifying at Parkhead.
Some fans are annoyed the Scottish champions' have failed to strengthen in the summer transfer window.
Boss Brendan Rodgers hopes it's not an ominous warning about his own future.
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Celtic head to Kazakhstan for the second leg of their play-off next week needing to win to qualify.
