Leicester have been targeting players with WSL experience in the January transfer window, having already signed Ashleigh Neville from Tottenham, Rachel Williams from Manchester United and Sarah Mayling on loan from Aston Villa.
Lehmann has been capped 64 times for Switzerland and won the Serie A title with Juventus in 2024-25.
During her time at West Ham, she was part of the squad that were runners-up in the 2018-19 Women’s FA Cup.
The forward is the most-followed female footballer in the world, exceeding 16 million followers on Instagram.
She also manages one of the 12 teams in the Baller League UK – a six-a-side football league with current and former professional players involved.