Aston Villa boss Martin O'Neill admits club owner Randy Lerner will be shocked by the coin throwing incident during their 0-0 draw with Portsmouth.
O'Neill admitted: "Randy will be extremely disappointed. He was here today. He honestly has a love affair with the club and that will be a setback, absolutely. It's not acceptable.
"In my time here I can't remember too many incidents. It's pointless, more than pointless, it's a criminal offence isn't it?
"I've had words with one or two boys behind the goal telling me how to do my job, quite forcefully at times, but that's part of it. This is different."