Jordan was first diagnosed with cancer at 25, something he managed carefully for some time, but it eventually took its toll. He returned to South Africa in January to be with his family following news his cancer had worsened.
"On behalf of the board, players, staff and supporters of Auckland City FC our deepest condolences go out to the Jordan family at this time," Auckland City chairman Ivan Vuksich said. "On the playing field Keryn was more than just a first class football player - he was a genuine entertainer who when in full flight brought pure joy to the hearts of those who were fortunate enough to see him play.
"Keryn was far more than just a football player to everyone at Auckland City FC. He was a unique individual that touched the hearts and lives of so many people at our club."
They were sentiments echoed by New Zealand Football chairman Frank van Hattum.
"Keryn provided a massive contribution to local New Zealand Football," said van Hattum.
"He was a wonderful player for Waitakere United initially and then Auckland City. We were lucky to have a player of his calibre involved within our domestic competitions.
"Beyond his footballing abilities, Keryn was a good friend to many people within the football community. Our thoughts are with his family and friends in both New Zealand and South Africa at this time."
Jordan is survived by his former partner, Sherry, and his teenage son Liam.
A minute's silence will be observed this Saturday when Auckland City take on Canterbury United at Kiwitea Street in a pre-season friendly. NZF are also exploring ways with his family and former New Zealand club to honour Jordan appropriately.