A Wentworthville Magpies junior, Sio went on to play for the Eels NYC in seasons 2009 and 2010. Possessing all the skills to be one of the deadliest finishers in Super League, Sio joined Hull KR from the Parramatta Eels at the start of the 2015 campaign. He made his NRL debut in Round 26 of 2011 against the Titans, scoring a try. Ken had a stellar 2012 year in a difficult season for the Eels, scoring 13 tries. He is a winger by trade who boasts both power and pace, resulting in a contract extension through 2014. He was heavily pursued by Clubs in the Super League towards the back end of his contract and elected to make the move overseas to sign with Hull KR. He was the winner of both the club’s Try of the Year and Tackle of the Year in Super League in his first season. A man with an incredible try scoring strike rate, better than a try every 2 games, the Knights have lured him back to Australia to once again play in the NRL.