Crystal Palace have taken immediate action after Wilfried Zaha was targeted by racist abuse on social media.
The Premier League club gave no details of when the abuse occurred.
A statement read: "Crystal Palace Football Club has taken action after one of our players, Wilfried Zaha, has again been subjected to racist abuse on social media.
"We will not tolerate this behaviour being directed at any of our players and will fully support them in dealing with such incidents.
"Any action we can take unilaterally as a club will be taken immediately and we will also seek co-operation from other clubs where relevant, following that we will pursue the matter criminally with the full force of whatever the law allows."
Crystal Palace have been contacted by the PA news agency for more details on the incident.
Ivory Coast international Zaha saw his summer disrupted by transfer speculation while he was away at the Africa Cup of Nations.
Having seen a move fail to materialise ahead of the deadline, with Arsenal and Everton both reported to be potential suitors, Zaha remained at Selhurst Park.
Palace beat West Ham 2-1 at the London Stadium ahead of the international break to sit sixth in the Premier League table.
The 26-year-old was reported to have been subjected to racist abuse in a series of posts on Twitter.
Anti-discrimination campaigners Kick It Out backed Palace's stance.
A statement read: "We fully support the response from Crystal Palace to the latest incident of vile racist abuse directed at Wilfried Zaha online.
"It's extremely frustrating to continue to witness hatred on social platforms.
"While recognising it is a wider social issue, we utterly condemn the language used and demand that the platforms come forward with appropriate actions."