Bukayo Saka was involved in a heated half-time row with Dani Carvajal during Arsenal's Champions League quarter-final showdown against Real Madrid.
Saka saw an attempted Panenka penalty saved by Thibaut Courtois during the first half and was confronted by Madrid defender Carvajal as he walked off the pitch.
Carvajal, who was not named in Madrid's matchday squad, followed Saka toward the tunnel before grabbing him on the back of the neck and pointing in his face.
The winger then swatted him away and as tensions threatened to boil over into a fracas, members of Arsenal's backroom staff intervened to lead Saka away.