Chelsea go into the second leg of their Europa League quarter-final clash against Slavia Prague with a 1-0 advantage.
The Blues will confident of progression at Stamford Bridge but they will have to be on their toes with such a narrow lead.
It is always dangerous to look past an opponent but with a place in a European semi-final at stake, thoughts inevitably turn to who might worry about their availability for the next round.
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Once teams get to this stage, disciplinary becomes an issue for some players who have gone a bit too over the top in their previous games and have received yellow cards for their troubles.
Players are suspended when they pick up three yellows in the competition but luckily for Maurizio Sarri there's only one player in his ranks that he needs to worry about on Thursday evening.
Chelsea escaped any bookings in the first leg so Sarri has a full selection to choose from in that regard, but if he picks Ross Barkley and the midfielder is awarded a yellow card he will miss the he will miss the first leg of the last four clash, if Chelsea qualify.
Slavia Prague have far worse troubles in that sense in their side, with six of their players currently one booking away from a second leg suspension.
Vladimir Coufal picked up a yellow in the first leg and now finds himself at risk of a ban but the list also includes includes defenders Ondrej Kudela and Jan Boril, midfielder Ibrahim-Benjamin Traore and strikers Peter Olayinka and Milan Skoda.
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