Rangers manager Ally McCoist has called on his players to maintain their discipline against Maribor in the Europa League play-off.
McCoist is particularly concerned as he has witnessed the dismissal of three of his players in Gers' last three outings.
Steven Whittaker and Madjid Bougherra were given their marching orders in the UEFA Champions League qualifier against Malmo.
And Maurice Edu was sent off last Saturday is the SPL clash against Inverness Caledonian after claiming the second goal in the 2-0 win.
This lack of discipline has concerned McCoist and as his team prepare for European combat again on Wednesday, he is aware they need to learn fast in Europe.
"The Malmo game was definitely a disappointment," said McCoist.
"To have players red-carded isn't ideal under any circumstances and I thought both of them were needless red cards.
"Maurice Edu's red card at Inverness was also needless so we have spoken about it."
He added: "There hasn't been any malice involved in the red cards or real devilment in any of the challenges; it's just been a bit of naivety that has cost us.
"So we have to be more intelligent and be clever in terms of our yellow and red cards, there is no doubt about that."