But the profile of the Women's Super League, England's top flight, has risen dramatically since its formation in 2011, leading to an influx of top foreign talent. Hayes pointed to this as a sign that England has surpassed the U.S. as the world leader in the growth of the women's game.
"We are setting the tone, the trend, the way in the world. It's always been about America but sorry, they lag behind us now. Yes, there may be a little more equality in terms of the teams they have in their league, the support the players get, but the interest in the game [here] is growing," Hayes said at a news conference to preview Chelsea's clash with Paris Saint-Germain in the Women's Champions League quarterfinals.
"It's a snowball, and I can't see anybody getting in the way of England becoming the best place in the world to play football."
Hayes began her illustrious coaching career in the U.S., spending five years in charge of the Long Island Lady Riders and Iona College before becoming Arsenal assistant manager in 2006, and also enjoyed a two-year spell in charge of NWSL side Chicago Red Stars prior to taking the reigns at Chelsea in 2012.
Hayes also believes that a three-year sponsorship deal with Barclays announced this week -- reported to be worth around £10 million -- shows a growing interest in the women's game in England.
"Tell me a league in the world in the women's game that can attract a sponsor like that and the level of investment?" she asked. "It's absolutely brilliant and credit to them.
"The best players aren't going to America. They're staying in Europe, and in fact they're coming to England."