The timing is unusual, with the All Whites about to tackle the fourth-best team from North and Central America for a place at next year's World Cup in Brazil. New Zealand are also due to host the 2015 Under-20 World Cup.
An announcement on the venue for the home leg of November's playoff is expected soon, with Wellington the most likely venue. The end of the World Cup cycle - whether that's in November or next July - seems a more logical time to step aside.
"Football and indeed sport management is a complex and difficult area to work in with many competing stakeholders, the inevitable struggle for sustainable funding and resources and a large agenda,'' NZF chairman Frank van Hattum said. "Grant has maintained the agenda and strategy development over the last two-and-a-half years.
The continuation of the Whole of Football programme, the rise of futsal and women's football, the games commitment to a new three-year strategy plan and maintaining New Zealand Football's modest surpluses are all areas that Grant can take pride in.''
McKavanagh will finish on July 12 but will continue to assist the board in their transition to a new chief executive and in advancing several projects.