Sangweni signed with Orlando Pirates at the beginning of the 2011/12 season. Hailed as one of the best signings of the season due to his defensive abilities. He was a regular starter for Bafana Bafana while playing for Golden Arrows. Siyabonga became a regular at Orlando Pirates and went on to have 28 league appearances in his first season at Pirates. Due to him being very instrumental in the Pirates treble winning of the season, he was nominated as a Footballer of the Season which eventually went to the League's leading goalscorer, Siyabonga Nomvethe of Swallows.