Arsenal boss Jonas Eidevall conceded Lia Walti's injury "did not look good" after the midfielder was stretchered off during the Gunners' 4-1 win over Everton.
Caitlin Foord opened the scoring for the visitors inside 29 minutes at Walton Hall Park, doubling her tally for the evening with a smart header just 10 minutes later. A stunning strike from Katie McCabe and header from Lotte Wubben-Moy saw Arsenal romp to a 4-0 lead before half time.
However, disaster struck for the Gunners just minutes into the second half when Walti was on the receiving end of a horror tackle from Chelsea loanee Aggie Beever-Jones, who was promptly shown a red card. Walti, who penned a new deal with Arsenal last week, was later seen leaving the ground on crutches, and Eidevall has admitted the Switzerland international will need to be assessed in the coming days.