He joins his brother James, who is also a director of The Rangers International Football Club plc, on the limited company board.
Mr Easdale said, "It's a pleasure and a privilege to join the board and I am looking forward to doing everything I possibly can to help move the club forward. It's my intention to help drive Rangers back to the very top of Scottish football.
"That's an aim that I share with everyone else connected with this club, especially the fans. Together, we can do great things."
In addition, Chief Executive Craig Mather and Financial Director Brian Stockbridge are members of the football board.
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