Uefa has charged Arsenal manager Arsene Wenger and midfielder Samir Nasri regarding comments towards the referee in the defeat by Barcelona.
Arsenal's Champions League hopes were dashed on Tuesday evening after Barcelona won 3-1 at Camp Nou to record a 4-3 aggregate victory.
However, the match was overshadowed by the second-half dismissal of Robin van Persie after the striker was penalised for time-wasting.
Swiss official Massimo Busacca showed Van Persie a second yellow card for shooting at goal just a second after he had blown the whistle for an offside decision.
At the final whistle, Wenger confronted Busacca and continued his exchange with the referee down the tunnel.
Speaking after the match, Wenger was critical of Busacca's decision and claimed it was 'embarrassing' that Van Persie had been sent off.
Wenger also suggested Uefa's representatives at the game were 'shocked' by the red card, which came just minutes after Arsenal had equalised.
Uefa had been waiting for Busacca's report on the match before deciding whether Wenger would face any disciplinary action over the incident.
A charge of improper conduct has now been levelled at Wenger and France international Nasri regarding comments made to Busacca after the match.
Did Robin van Persie deserve to be sent off against Barcelona?