GAA pundit Joe Brolly has said his lawyers are examining social media posts about him.
The barrister and podcast host revealed he had instructed solicitors in a post to the X platform.
The claim follows posts about him made by mixed martial arts star Conor McGregor after riots in Dublin that followed a knife attack on children and a carer.
Mr Brolly had criticised X posts made by the UFC fighter following the attack, which prompted further posts about the former Derry GAA footballer from McGregor.
On Saturday, Mr Brolly wrote: "My lawyers are examining tweets about me from an individual."
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He did not name the individual, but added: "These include incitement to hatred, violence and defamation."
On the day of the riots in Dublin, McGregor wrote in a post: "Ireland, we are at war."
The fighter's comments were criticised by Mr Brolly at an event in Dublin's 3Arena last Tuesday.