The 29-year-old from Ballymena was third in the 2014 and 2018 Games at welterweight and middleweight respectively and will begin his career in the paid ranks at 154lbs.
Donnelly said: “I’ve been to three Commonwealth Games and then qualified for the Olympics through the semi-pro World Series of Boxing.
Exciting debutant Mace Ruegg turns pro with MTK Global
'I’d beat any of the British welterweights out there' - John O’Donnell targets British title
Unbeaten Commonwealth champion Jay Harris next fight revealed