UEFA has rejected appeals from Spartak Moscow and Zenit St Petersburg against sanctions over crowd trouble in last season's Europa League.
The two Russian clubs were fined and their supporters banned from attending future European matches after incidents against Athletic Bilbao and RB Leipzig respectively.
Spartak were charged earlier this summer over crowd disturbances, the setting off of fireworks and throwing of objects in their last-32 clash against Athletic, and were fined 55,000 euros and banned from selling tickets to their fans for their next two away games in UEFA competition, with a third match suspended for two years.
Zenit's fans were found guilty of racist chanting against Bundesliga side Leipzig in the last 16, in addition to the throwing of objects and blocking of stairways.
The club were fined a total of 70,000 euros and ordered to play their next European game behind closed doors.
In both cases, a statement released by UEFA on Wednesday announced: "The appeal lodged by (the club) has been dismissed and the CEDB's (control, ethics and disciplinary body's) decision of 31 May is confirmed."
Zenit's spectator ban will apply to the home leg of their Europa League third qualifying round tie this season. Spartak will enter the Champions League at the same stage.