The 29-year-old midfielder chose the No. 18 shirt as a tribute to his idols Wayne Rooney and Paul Gascoigne, both of whom wore the number at Everton.
Grealish consulted Wayne Rooney before making the move to Merseyside, expressing his excitement about joining the club.
Everton manager David Moyes, who has made Grealish his sixth summer signing, hopes the loan spell will help the player regain his form and return to the England squad.
Grealish stated that choosing Everton was an easy decision after being deemed surplus to requirements at Manchester City, having only started one Premier League game in 2025.