The Football Association are to investigate the coin-throwing incidents at two Premiership matches over the weekend.
Arsenal striker Robin van Persie was struck by a coin at Upton Park on Sunday during the Gunners’ 1-0 defeat to West Ham.
On Saturday, Fulham’s Claus Jensen was hit by a coin thrown by a fan in their 1-0 victory over Everton at Craven Cottage.
“We will be looking at the referees’ reports and speaking to the relevant clubs,” said an FA spokesman.
“We want to see what steps the clubs are taking to identify who is responsible.
“The key thing is to identify those responsible and make sure they are dealt with appropriately.”
Fulham manager Chris Coleman and his West Ham counterpart Alan Pardew have both called for tough penalties for the perpetrators.
Coleman said: “I hope the offender is identified. It was a coward who threw the coin. Send him to prison or somewhere away from football.”
Pardew added: “That one fan should be ashamed and I hope we can see him on CCTV and never let him come back to the ground again.”