Sanni Maija Franssi (; born 19 March 1995) is a Finnish professional footballer who plays as a forward for WSL club London City Lionesses and the Finland women's national team.
Franssi has played in the youth sectors of , Hyvinkään Palloseura, Koivukylan Palloseura and .
Franssi made her league debut against ÃÂ land United on 15 April 2012. She scored her first league goal against GBK on 23 March 2016, scoring in the 9th minute. In 2016 Franssi was named Naisten Liiga Player of the Season after hitting 20 league goals for her club, PK-35.
Franssi spent the 2016âÂÂ17 season with FC Zürich Frauen, scoring 16 goals and finishing as runner-up to FC Neunkirch in both the Nationalliga A and Swiss Women's Cup.
Franssi returned to PK-35 in July 2017. She made her league debut against JyPK on 8 July 2017. Franssi scored her first league goal against TPS on 15 July 2017, scoring in the 32nd minute.
Franssi signed for newly founded Serie A club Juventus in September 2017. She made her league debut against Atalanta on 30 September 2017. Franssi scored her first league goal against Empoli on 28 October 2017, scoring in the 10th minute.
Franssi made her league debut against Odense Boldklub Q on 8 September 2018. She scored her first league goal against B 93 on 16 September 2018, scoring in the 67th minute. On 27 April 2019, Franssi extended her contract by one year.
On 17 July 2020, Franssi was announced at Real Sociedad. She made her league debut against Deportivo de La Coruña on 11 October 2020. Franssi scored her first league goal against Dux Logroño on 11 November 2020, scoring in the 70th and 79th minute.
In December 2021 Franssi was playing for Real Sociedad of Spain's Primera División but was reported to be attracting transfer interest from multiple clubs in England's FA Women's Super League. On 6 April 2022, Franssi's contract was extended for two years.
On 4 July 2025, newly promoted Women's Super League club London City Lionesses announced the signing of Franssi.
Franssi played her first senior international for Finland women's national team in February 2015 against Sweden. She had already represented her country at the 2014 FIFA U-20 Women's World Cup.
She scored her first senior international goal in a 3âÂÂ2 UEFA Women's Euro 2017 qualifying defeat by Portugal on 16 September 2016.
Franssi was called up to the 2018 Cyprus Women's Cup. She was also called up to the 2019 Cyprus Women's Cup.
Franssi was called up to the 2020 Cyprus Women's Cup.
Franssi was called up to the Finland squad for the UEFA Women's Euro 2022.
Franssi was part of the Finland squad that won the 2023 Cyprus Women's Cup for the first time.
On 19 June 2025, Franssi was called up to the Finland squad for the UEFA Women's Euro 2025.
FranssiâÂÂs younger brother is ice hockey player Santeri Hatakka.