Fred Couples will miss this week's Scottish Open at Loch Lomond because of a back injury.
The 43-year-old American, who won the US Masters in 1992, was hoping to make his debut at the event in preparation for next week's British Open at Royal St George's.
Couples is still hopeful of recovering in time to play in the Open, in which he has been a regular top-10 finisher and was third in 1991.