In September 2006, Jeff signed for the New Zealand Football Championship club Waitakere United for the 2006–2007 season.
[13] On 3 March he played against the Australian league leaders, Sydney Olympic, scoring two goals in the second half to give the Kingz its first victory.
[19] He played only one match for Adelaide after it transpired he had been suffering from an injury when he joined the club, despite signing a two-year contract.
[22] In September 2000, Campbell won the New Zealand Soccer Media Association young player of the year award, ahead of fellow nominees Chris Killen of Manchester City and Allan Pearce of Barnsley.
[23][24] Campbell had represented New Zealand at under-20 and under-23 level,[19] but was in line for selection to the Australian senior national team for the 2000 Summer Olympics.