Russo moved to Arsenal after her contract with Women's Super League rivals Manchester United expired. The 24-year-old scored 10 goals in the Women's Super League last season as United finished runners-up to Chelsea.
The 24-year-old has already given her first interview as a new Arsenal player and said she was "very excited" to start her new adventure.
"It's so exciting. Today's been amazing, meeting everyone, and settling in and I'm really excited to be here now. I can't wait to get going. Time for a new challenge. I'm really excited to get going, get into Champions League and into the league next season," she said.