"Every successful football tournament helps grow the game globally," said Putellas. "When fans become engaged with international football, that excitement often carries over to other competitions."
London City owner Michele Kang has aggressively targeted international talent. The club previously signed Mary Earps, Janni Thomsen, and Nicole Anyomi this summer.
"Alexia Putellas embodies the pinnacle of talent, dedication, and vision in women's football," said Kang.
"Her decision to join our independent, women-first club is a powerful endorsement of what we are building at London City."
Goalkeeper Mary Earps expressed enthusiasm about Putellas' arrival.
"It's really exciting to be playing alongside a lot of great players and Alexia's signing is massive for the club," said Earps.
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London City Lionesses finished sixth in the WSL last season. The squad will begin pre-season training ahead of the upcoming campaign.
