Hayes' announcement has rocked the WSL. The 47-year-old has won 13 major trophies since taking over at the Blues in 2012 and her exit could spell an end to Chelsea's dominance of English football.
The London outfit are chasing their fifth successive WSL title and while Hayes is at the helm, that is very much a possibility. But when she does take over at the USWNT following the end of the season in May, it will be the end of a hugely important era.