Fennell was the subject of a controversial club transfer move from his club O'Tooles to northside rivals St Vincents. The transfer was rejected by his own club and then by the Dublin county board with Dublin's Cork born county chairman Gerry Harrington giving the deciding vote. The verdict is expected to be appealed. The reason given for the rejection was "A player is considered to always owe allegiance and loyalty to the club he first legally participated with in club competition." The transfer to St Vincents was finally agreed on 15 February 2011.