Brunt was struck on the face by a coin thrown by a West Bromwich Albion fan after the FA Cup fifth-round tie against Reading at the Madejski Stadium.
The 31-year-old winger had gone over to give his shirt to one of the Baggies fan after the 3-1 defeat to Championship side Reading.
One @WBAFCofficial fan has let the whole club down! Surely Chris Brunt applauding the traveling fans after an away loss shows he cares?— Trevor Sinclair (@trevor8sinclair) February 20, 2016
Brunt has been on the books of West Brom since 2007 and has a contract until June 2017.
The Northern Ireland international has created 21 chances in 21 Premier League appearances for the Baggies so far this season.
The winger has a pass accuracy of 70% and a shot accuracy of 27%, and has won 25 headers, 14 dribbles and 22 tackles.