CELTIC duo Jozo Simunovic and Olivier Ntcham will both walk a suspension tightrope in tonight’s crucial Europa League second leg against Zenit St Petersburg.

Cautions picked up during the Hoops’ Champions League adventure have been transferred to UEFA’s secondary competition and the players are one booking away from missing a potential last-16 first leg clash.

Defender Simunovic was shown yellow cards in each of the heavy defeats to French side PSG during their Group B campaign, while Ntcham had his name taken in their final Champions League game against Anderlecht and in last Thursday’s 1-0 victory over Zenit in Glasgow.

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Celtic captain Scott Brown, Moussa Dembele, Mikael Lustig, Eboue Kouassi, Nir Bitton, Patrick Roberts and Anthony Ralston have all picked up a booking each.

But should Brendan Rodgers’ side make it all the way to the semi-finals of the Europa League, all cautions will be cleared.