Leah Williamson has been ruled out of the second leg of Arsenal Women's Champions League second-round tie against Hacken due to concussion protocol.

Williamson missed the Gunners' WSL opener against Manchester City last weekend, which ended in a 2-2 draw at the Emirates Stadium.

Lotte Wubben-Moy, Williamson's England team-mate, and Laia Codina, who won the World Cup with Spain last year, are in line to continue in defence as Arsenal look to overturn a 1-0 deficit from the first leg.

Victoria Pelova and Steph Catley were also absent from training on Wednesday.