Migchelsen has agreed to terms to be the assistant coach for the South African women's national team working under fellow former Dutch international Vera Pauw.

United chief executive Heather Reid will make a recommendation to the Capital Football board of who should be the club's new coach.

While United has won its two championships with European coaches at the helm, Reid said there was a "good chance" an Australian-based coach would take the reins for next season.

That statement puts current assistant coach Raeanne Dower as the leading contender for the position, although there are other candidates within the W-League and state league programs.

Reid said while it was disappointing to lose a coach of Migchelsen's calibre, she understood the reasons behind her decision.

"This is a wonderful opportunity for Lizz to work with Vera, who is her long-time mentor, so we totally understand her reasons for not coming back to Canberra," Reid said.

"We were the first W-League club to appoint highly qualified coaches from overseas and we have been delighted to see both Jitka and Lizz progress to national team appointments on the international stage.

"These coaches led our green team to two premierships and two championships wins and you couldn't ask for much more than that."

Dower has worked alongside Migchelsen for the past two seasons and her appointment would make for a smooth transition.

Migchelsen collected silverware with United in both of her seasons since taking over from former Czech Republic international Jitka Klimkova for the 2013-14 campaign.

Klimkova led United to the club's first title in 2011-12 before leaving to become the head coach of New Zealand's under-17 women's squad.

United won the league premiership in Migchelsen's first season before being knocked out in the semi-finals by Melbourne Victory at McKellar Park.

It was a different story last season, United finishing third in the regular season before upsetting Victory at Geelong on a penalty shoot-out to progress to the grand final.

United then caused a massive boilover when it knocked over the top of the table Perth Glory in another penalty shootout to claim the championship.

South Africa failed to qualify for this year's women's World Cup and is ranked No.60 in the world.

Migchelsen will be responsible for coach education, talent identification, instruction courses and scouting programs as well as mentoring the coaches of the South African youth academy squads.

United will start pre-season training at the end of August before the start of the next W-League season in early October.