An inter-county footballer failed a drug test following an Allianz League game earlier this year - Mirror Sport understands.
It is believed the player is launching an appeal after testing positive for a banned substance that breaches Sport Ireland's anti-doping regulations, which apply to inter-county footballers and hurlers in GAA.
Mirror Sport has contacted Sport Ireland for comment.
Two inter-county footballers have served bans in recent years for anti-doping violations.
Monaghan's Thomas Connolly served a two-year ban from 2015-2017 after testing positive for an anabolic steroid.
Connolly argued that he had taken pills which had been labelled incorrectly and was not aware of the presence of the banned substance.
The GAA anti-doping hearings committee accepted Connolly's claim that the steroids were not taken intentionally.
Kerry's Brendan O'Sullivan was suspended in 2016 for taking a banned stimulant which had been contained in a fat-burning supplement.
O'Sullivan explained that the contaminated product had been labelled incorrectly and was banned for 21 weeks after a disciplinary panel accepted that explanation.
Since 2001 the GAA have been drug testing players as part of an agreement with the Irish Sports Council (now Sport Ireland) and their policy to cooperate with international anti-doping efforts.
The GAA states on its website that 'doping is contrary to the spirit of sport and every member has a duty to ensure that Gaelic games are free of doping'.
