Western Sydney's sputtering W-League campaign has suffered another major blow, with star striker Lynn Williams granted permission to skip the rest of the season to focus on her national team commitments.

Arguably the highest-profile player left in the competition after a recent exodus of Matildas, the 26-year-old scored four goals in five appearances for the Wanderers - a platform that helped her earn an international recall for the United States' Olympic qualifying campaign.

Lynn Williams won't play again for the Western Sydney Wanderers this W-League season. Credit:Louise Kennerley

But her success has proved a double-edged sword for the Wanderers, who have agreed to release Williams so she can prepare for the SheBelieves Cup - an invitational tournament against England, Spain and Japan that begins next month - as she continues to push her selection case for Tokyo 2020.

“I would like to thank the Wanderers for taking a chance on me and seeing me as a vital part of the team," said Williams, who is back in Australia but did not feature in Saturday's 3-0 defeat to Sydney FC.