Celtic captain Scott Brown says the Parkhead club's recent signings need to stand up and be counted as the Glasgow giants take on Shakhter Karagandy for a place in the group stages of the Champions League.
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The Hoops face the Kazakhstan champions at Celtic Park on Wednesday looking to overturn a 2-0 deficit from their first leg in Astana.
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There is a place in the lucrative group stage of Europe's elite competition for the winner while the loser will drop into the group stages of the Europa League.
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Scottish international Brown is confident recent signings Amido Balde, Virgil van Dijk, Steven Mouyokolo and Derk Boerrigter will make the grade at the Glasgow giants.
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But the midfielder says the summer signings don't have time to ease themselves into the team and must start making an impact as Celtic face their most crucial game of the season.
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"It took me a good six months to settle in but these days there isn't that much time," the Celtic captain said.
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"They're straight into big games. I don't know if they realise how huge a club Celtic are but that's why you come here - to play in the Champions League, in the big matches. They'll figure that out very quickly.