There'll be no one at Rangers in any doubt of the need for an immediate reaction. Giovanni van Bronckhorst 's side were left badly bruised in Belgium on Tuesday, returning home with their Champions League dream hanging by a thread.
They'll have the chance to right those wrongs when Union Saint-Gilloise come to Ibrox next week but first up there's domestic business to take care of. Rangers host Kilmarnock on Saturday in need of a statement performance as well as the all-important three points.
Van Bronckhorst's team were forced to dig deep against a resolute Livingston last Saturday and it's likely to be a similar story this weekend. Derek McInnes will have his side well drilled and ready to frustrate but also with an eye on causing an upset in Glasgow.
He may just face a Rangers team with several changes from Tuesday, so poor was their midweek showing. New signing Ridvan Yilmaz insists he's ready to play and he could replace Borna Barisic at left-back. James Sands was far from Rangers' worst offender but Van Bronckhorst may feel it's time to get Ben Davies into his backline.
In midfield, Rangers badly lacked a spark with Ryan Jack, Glen Kamara and John Lundstram and the manager could call on Steven Davis to come in and set the tempo against Killie. Malik Tillman looks a threat and he could keep his place, while Ryan Kent is expected to return and Tom Lawrence will feel he deserves a chance to start.
Up top, Rangers fans are desperate for the return of Alfredo Morelos but a starting berth may just come too soon for the Colombian, plus the fact Van Bronckhorst will want to give Antonio Colak every chance to open his account - dropping the new man now could have long-term effects on his confidence.
Predicted Rangers XI: McLaughlin; Tavernier, Goldson, Davies, Yilmaz; Davis, Lundstram; Lawrence, Tillman, Kent; Colak.