Arsenal fans reacted in unison and were said to be left with 'goosebumps' as Alexandre Lacazette stared down Slavia Prague's players as the Gunners took a knee before kick-off.
The two sides met in the Europa League quarter-finals on Thursday night and before kick-off Arsenal, as has become customary, all took a knee as a gesture to raise awareness in combating racism.
Slavia Prague, who saw one of their players given a 10-match ban by UEFA this week for 'racist behaviour' towards Rangers' Glen Kamara in the previous round, stood while Arsenal dropped to one knee.