Speaking upon her unveiling, Batlle, who will wear the No.22 shirt, said: "I’m very happy and excited to get going. Arsenal is one of the biggest clubs in the world and I can’t wait to feel the joy of playing in front of our supporters at Emirates Stadium alongside so many great players. I want to win trophies and I feel this is the right place to achieve that."
Gunners boss Renee Slegers added: "I’m delighted that we’ve been able to bring Ona to the club. She’s a hugely experienced full-back with strong attacking intent and great physical attributes. She’s a winner and we want to go for more wins together."
Clare Wheatley, Arsenal's director of women's football, said: "Ona’s track record at both club and international level speaks for itself - she’s a proven winner with a hunger to add more trophies. We’re delighted to bring one of the best defenders in the world to Arsenal, and I know our supporters will make her feel welcome straight away."