FFA boss David Gallop insists former Matildas mentor Tom Sermanni's exit from the US women's national team has no bearing on the future of under-pressure Australia coach Hesterine de Reus.

Sermanni, who took over the US women's team in January 2013 after eight years at the helm of the Matildas, was sacked on Monday - hours after the Americans beat China 2-0 in Colorado.

De Rues has been in the spotlight in recent days because of a player revolt against the Dutch disciplinarian, but Gallop insisted the timing of Sermanni's exit was entirely coincidental.

"This is a coincidence only," Gallop said.

Football Federation Australia are currently investigating and compiling a report after the players' union approached the governing body to take action against the 52-year-old de Reus.

Gallop said national technical director Han Berger, head of national performance Luke Casserly and former Matilda and current women's football co-ordinator Sarah Walsh were putting the report together.

"Our process is now in place and our team are working on pulling it together as soon as possible," he said.

The Matildas lost 1-0 to Brazil in Queensland on Sunday as they continue preparations to defend the Asian Cup title they won under Sermanni in 2010.

Gallop wouldn't be drawn on whether de Rues will remain coach for the Asian Cup in Vietnam next month, when 2015 Women's World Cup qualification is also on the line.

Sermanni, who guided the Matildas to the knockout stage of the Women's World Cup in both 2007 and 2011, had a successful first year as US coach.

The Americans were undefeated under him, winning 13 matches and drawing three.

However, the side struggled at the Algarve Cup in Portugal last month, dropping two matches and finishing an uncharacteristic seventh.

US Soccer president Sunil Gulati thanked Sermanni for his service but said they wanted to go in "a different direction" and would look to hire a new coach immediately.

"I'm disappointed that things didn't work out, but I'd like to thank US Soccer for the opportunity to have coached this team and also the staff and players for all their hard work," Sermanni said in the US Soccer statement.