Video footage shows the moment Super Eagles attacking midfielder and Arsenal star Alex Iwobi lands a savage slap on the back of the young Frenchman’s head.
The sound of the connection makes a large thud and the 19-year-old is sent rocking forward.
He then turns around to give his team-mate a stern warning.
Some Arsenal fans found it hilarious.
“Hahaha Iwobi absolutely clocked him around the head,” one stated.
Another added: “That slap on Guendouzi tickled me.”
But others did not take it so lightly.
“Jesus Christ he absolutely battered him with that,” a third suggested.
And a fourth even claimed: “Iwobi almost knocked Guendouzi out there.”
The Gunners have enjoyed recent success in the Premier League, winning their last three games.