For the first time in the Women's Super League era, Birmingham City, Crystal Palace, and Charlton Athletic have joined the top flight for the 2026-27 season. This expansion increases the league from 12 to 14 teams, with all newcomers kicking off their campaigns on Sunday, following the season's opening match on Friday where London City Lionesses host Manchester United.

Birmingham City returns to the WSL after a four-season absence, having clinched the WSL 2 title last season. The Blues secured the trophy by edging out Palace and Charlton on goal difference, showcasing their strength by scoring the second-most goals and conceding the second-fewest in the league. Striker Lily Crosthwaite, recently awarded WSL 2 player of the year, leads a squad that includes new captain and experienced centre-back Millie Turner. Head coach Amy Merricks expressed confidence in the team's readiness for the upcoming challenges.

Crystal Palace, familiar to WSL supporters, returns to the top flight after just one season in WSL 2. Despite finishing with one win fewer than Birmingham, they were tough to beat, recording only four defeats. Key players include attackers Kirsty Howat and Abbie Larkin, both top scorers, and the addition of former Lioness Bethany England, who brings significant experience and goal-scoring prowess.

Charlton Athletic last competed in the WSL 18 years ago. Under head coach Karen Hills, they finished strong in WSL 2, leading for most of the last season before a final-day slip. They advanced to the WSL after a tense play-off victory against Leicester City, winning 2-1 on penalties. Despite being the lowest scorers in the top six, they boasted the best defensive record. New signing Paula Partido, a Spanish playmaker, adds creativity to the squad, having previously played for clubs like Real Madrid and Celtic.