American forward Williams arrived in Australia fresh from a brace for her country in the USA's 6-0 friendly win over Costa Rica earlier this month. 

Meanwhile Irishwoman Denise O'Sullivan joins as the winner of the Irish PFA Women's Senior International Player of the Year Award for 2019. 

With enormous expectations on the Wanderers' new international recruits, Heffernan hailed their impact on the squad already during their short time in Australia. 

"The first session for Lynn and Denise we told them to go and do a cool down while the rest of the squad did some top ups with some fitness and some sprint work," Heffernan said. 

"They stood alongside them, cheered them on and supported them, you don't see that too often, there's a good special feeling with the group at the moment.

"We're more impressed about who they are as people first and seeing that at training on Monday, it helped the players through their physical work. It was brilliant to watch." 

Wanderers stole three points in a 2-1 win at home to Adelaide last week with Kyra Cooney-Cross scoring a debut winner in the opening game of the season.

Western Sydney play their first match at Bankwest Stadium on Friday as they welcome Newcastle Jets who drew 1-1 at home last week to Melbourne City.