Albion midfielder Katie Robinson will miss the rest of the season after suffering an ACL injury in training.
The 18-year-old, who joined the Seagulls from Bristol City in the summer, made her WSL debut in the 2-0 win over Birmingham City earlier this month.
She will undergo an operation in the next few days.
Head coach Hope Powell said, "It's very disappointing for Katie, who had come to the club in pre-season and settled in really well. We wish her all the best for the surgery and her rehabilitation and we will support her every step of the way in her recovery."