Crystal Palace have vowed to indefinitely ban anyone found guilty of throwing coins at recent home matches.
Newcastle captain Fabricio Coloccini was struck by an object, reported to be a coin, when celebrating a goal with team-mates during last week's 1-1 draw at Selhurst Park.
Magpies manager John Carver said the Argentinian defender could have been blinded for life, while a similar incident occurred during Saturday's 2-1 home defeat to Liverpool in the FA Cup fifth round.
Those incidents are being investigated and Palace have released a statement calling for such behaviour to stop immediately.
"We have conducted our own investigation into the incidents at our last two home matches, as well as making our CCTV footage available to the police," read the statement on the club's official website.
"We take a zero tolerance approach to this sort of behaviour and, if the perpetrators are identified, they will be banned indefinitely from the stadium.
"If they are season ticket holders their cards will be made void without a refund. The stupid behaviour of a few supporters risks creating a negative image of our club and we would appreciate the help of Palace fans in identifying the culprits, who are not welcome at Selhurst Park.
"The club already has extensive security measures in place, including body cameras for stewards, and will continue to improve CCTV coverage at the ground."