Arsene Wenger says Christian Fuchs threw the ball at Alexis Sanchez "on purpose" and should have been booked after a late incident during Arsenal's 1-0 win over Leicester on Wednesday.
Robert Huth's own goal handed Arsenal victory at the Emirates but Gunners striker Sanchez stole the headlines.
As Leicester chased an equaliser, defender Fuchs took a throw-in and seemingly aimed the ball at Sanchez.
The Chilean went down theatrically after a short delay, and was booked.
The ball hit Sanchez on the shoulder, but the 28-year-old fell to the ground clutching his face and was handed a yellow card by referee Mike Jones for not retreating far enough.