Coleraine have condemned the actions of a "small minority of fans" after the club was hit with a £200 fine from the Irish FA.
It follows a breach of Article 33 of the IFA Disciplinary Code which revolves around spectator conduct.
The club says the fine was imposed after items were thrown at Glentoran goalkeeper Aaron McCarey during last month's Danske Bank Premiership fixture at the Showgrounds.
The club said in a statement posted on their website: "With a record number of season tickets being sold, ground improvements at The Showgrounds and a BetMcLean League Cup final on the horizon, it is disappointing that the actions of a small minority of fans means the club have to pay unwelcome fines.
"Coleraine FC stresses the importance that supporter misconduct must be avoided – including sectarian chanting to stop – as the club runs the risk of even costlier punishments being imposed.
Coleraine chairman McKendry described the spectator conduct as "totally unacceptable".
He added: “It is costing the club money and reputational damage and it is a shame the actions of a small minority of people means we have been fined.
“We have enjoyed healthy attendances at The Showgrounds so far this season and we won’t accept behaviour like this.”
Article 33 of the Irish FA's Code of Conduct centres on Liability for Spectator Conduct.
Improper conduct includes, but is not limited to, violence towards persons or objects, letting offincendiary devices or causing explosions, throwing missiles, the use of laser pens, displaying insulting slogans in any form, uttering insulting word(s) or sound(s), using offensive gestures or invading the pitch.
