Arsenal and Leeds have both condemned the "vile" abuse directed at Nicolas Pepe and Ezgjan Alioski after Sunday's Premier League game at Elland Road.
However, Alioski's reaction annoyed the Arsenal players and Scotland defender Kieran Tierney had to be pulled away from the Leeds man after the final whistle as he made his feelings known.
Pepe and Alioski were both targeted on social media, leading the clubs to release co-ordinated statements, in which they promised to work with the police and football authorities to identify those responsible.
"We utterly condemn the vile abuse directed at Nicolas Pepe and Ezgjan Alioski on social media," said Arsenal in their statement.