Speaking to Sky Sports before the game, Arsenal head coach Jonas Eidevall said of Williamson: "[It's a] minor injury, really unfortunate, but it keeps her away from this fixture here."
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Williamson wasn't the only absentee for Arsenal, with fellow centre-back Amanda Ilestedt also ruled out of the game due to illness. It meant that Laia Codina was named to the starting XI for just the third time in the WSL this season, alongside England international Lotte Wubben-Moy.
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Williamson was one of four players to suffer a devastating ACL injury at Arsenal last season, along with Beth Mead, Vivianne Miedema and Laura Wienroither. After making her initial comeback before Christmas, Miedema returned to the Gunners' matchday squad for Saturday's game following a knee irritation.