Brunt was struck on the face by a coin thrown by a West Brom 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.
Whoever threw that coin at Chris Brunt today, thousands if not millions of kids will see or hear about it. You're a disgrace.— Ben Foster (@BenFoster) 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.
West Brom are 14th in the Premier League table at the moment with 32 points from 26 matches.