PSG handed Lyon their first women's first division defeat in almost four years when Marie-Antoinette Katoto earned them a 1-0 home win.
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Lyon reached the final of the Women's Champions League for the fifth-straight time on Wednesday with a 1-0 win over PSG.
Holders Lyon edged out Bayern Munich 2-1 in their UEFA Women's Champions League quarterfinal to set up an all-French clash in the semis against PSG.
Formiga will extend her professional career into a 27th season after signing a one-year contract extension with Paris Saint-Germain's women side.