After beginning her career at age nine with FC Konolfingen, where she played from 2008 to 2011, Lehmann joined the U14 BSC YB team as a 12-year-old. She also trained with the U13 to U15 boys' teams three times a week and played in two matches on the male junior teams.[3]
Lehmann started her senior professional career at Swiss club BSC YB at age 17. In her first season, she scored a hat-trick in a 3–0 win against FC Staad.[3] She was top scorer for her team that season with nine goals.[4] She went on to score 25 goals in 52 league appearances during her time at the club.[5]
Lehmann scored both goals in a 2–1 win over Reading on 20 February 2019.[8] In April 2019 West Ham extended Lehmann's contract after she scored nine goals in 30 appearances in all competitions[9] and helped the club reach the FA Cup final[10] by scoring the equalising goal in the semi-final match against Reading on 14 April 2019.[11]
On 3 November 2019, Lehmann scored in the 75th minute against Reading for a 1–0 win that helped her team advance to the knockout stage of the 2019–20 Conti Cup.[12] On 19 January 2020, when West Ham was behind 1–0 to Brighton, Lehmann scored two goals in the 80th and 83rd minute to give her team a 2–1 victory.[13][14] She was shortlisted for the BBC Super League Young Player of the Season award for the 2019–20 season.[15]
Everton (loan)
On 27 January 2021, it was announced that Lehmann had moved to Everton on loan[16] until the end of the season.[17] She earned her first start for the team on 14 February against Reading.[18] She scored her first goal on 11 March against Birmingham City.[19]
Aston Villa
Lehmann then joined Aston Villa for the 2021–22 season.[20] She scored her first two goals for Aston Villa on 2 December 2021 against Sunderland.[21] In the match against Leicester City on 23 January 2023, the score was 1–1 until Lehmann scored a winner in the 93rd minute.[22] She was named Women's Supporters' Player of the Season for 2021–22.[23]
In July 2022, she signed a one-year contract extension with Aston Villa for the 2022–23 season, having made 23 appearances and scoring four goals during her first season at the club.[24]
On 26 March 2023, she made two goals and an assist in a 5–0 win against Leicester City. In this game she completed 100 percent of her dribbles and earned Player of the Match.[25] At the end of the 2022–23 season, having made 54 appearances for Aston Villa, Lehmann extended her contract until June 2026, with the option of extending for a further year after that date.[26]
Lehmann made her debut for the Swiss U-17 national team on 11 April 2015, defeating Serbia 8–1 during the elite qualifying round of the 2015 U-17 European Championship. She scored her first goal five days later, sealing the score with opponents Finland at 4–0 in the 61st minute.[30] In the final tournament, she played in five out of six games. She scored the goal in a 1–0 win against the Republic of Ireland and helped her team finish first in their group.[31] Switzerland reached the final but lost 5–2 to Spain.[32]
Selected by coach Nora Häuptle for the qualifying phases of the 2017 U-19 European Championship, Lehmann made her U19 national team debut on 18 October 2016 against Estonia and scored her first U19 goal in this match. Lehmann then scored a hat-trick in the following match against Croatia, and another hat-trick in a 3–3 draw with Czechia. She played in all the remaining matches of the elite phase, but Switzerland did not qualify.[32]
At the U-19 European Championship at home in Switzerland in July 2018, Lehmann scored the equalizer in the 80th minute making it 2–2 against France.[35] After a 2–0 loss to Spain, she scored again in a 3–1 win over Norway.[36] With a win, a draw, and a loss, the Swiss retired in the preliminary round. Lehmann played in all three games.[37]
Senior
Lehmann won her first cap for the senior Switzerland national team on 22 October 2017 in a friendly against Japan, coming on as a substitute for Eseosa Aigbogun in the 55th minute. She scored her first international goal on 2 March 2018 against Finland at the 2018 Cyprus Cup.[38] She played her first official international match on 5 April 2018 in a 1–0 victory over Scotland for qualification to the 2019 World Cup. In May 2019, she sustained an ankle injury during national camp training and underwent surgery.[39]
Lehmann was part of the team that qualified for the 2022 UEFA European Championship. She scored a goal in a 2–1 victory against Belgium.[40] In the final must-win match for Switzerland, Lehmann helped her team reach the Euros during the penalty shootout against Czechia when she stepped up as the third shooter and successfully made it 1–1.[41] She was eventually not available for the 2022 Euros because she felt she was not "mentally ready" to be involved in the tournament.[42] On 3 July 2023, she was selected for the 2023 World Cup.[43] She played in two out of three group stage matches, coming on as a substitute both times. Switzerland were eliminated by eventual champions Spain in the Round of 16.[44]
Lehmann is openly bisexual. She formerly identified as lesbian.[45][46] She previously dated Swiss national teammate Ramona Bachmann.[47] Although they were believed to have split in 2022,[48] as of June 2024, Lehmann was in a relationship with Brazilian Juventus midfielder Douglas Luiz.[49]
In popular culture
In 2019, Lehmann was featured in the BBC Three series Britain's Youngest Football Boss with her then girlfriend Ramona.[50]
As of 29 December 2023, she has more than 16 million followers on Instagram, making her the world's most-followed women's footballer.[51][52]