There have been major concerns around the culture and environment of the team since Heraf came to be in charge. 

NZF released a statement this morning saying it has "received a letter from the NZ Professional Footballers Association (NZPFA) last night with a number of complaints from the players of the Football Ferns".

The Herald has reported Heraf could be suspended from his role with NZ Football planning to launch an official investigation. 

The issue was brought to light last week after Heraf told press in a post-match interview that New Zealand could never compete with a team like Japan after they lost 3-1 to Japan in a friendly match. 

Former captain and New Zeland's most capped player ever, Abby Erceg decided to enter into retire once again, citing it was a result of Heraf's tactical approach.

Heraf has been in charge of the Football Ferns since December 2017, with the side having played three games, including two games against Scotland in March, all which they have lost.

New Zealand Football are currently reviewing the complaints and are set to release a further statement tomorrow.