Former champion John Daly has withdrawn from next week's British Open golf through injury, organisers have confirmed.

The 47-year-old American, who won the major in 1995, will miss the 18-21 July championship at Muirfield. He wrote on Twitter last week that he needed surgery on his elbow.

"Stephen Gallacher is the first reserve and will take his place in the championship," organisers said in a statement.

Briton Gallacher, 38, has won two European Tour events, the most recent of which was the Dubai Desert Classic in February.

A total of 18 players have had their places confirmed in the last 24 hours.

Denmark's Thomas Bjorn, who tied for second in 2000 and led the 2003 tournament by two shots with three to play, only to take three to get out of a bunker and hand the title to unknown Ben Curtis, has qualified via his position in the Race to Dubai and will make his 16th appearance.

Scotland's Marc Warren will make his Open debut as his joint-second at the BMW PGA Championship in May meant he was high enough up the rankings to earn a place.

Three other European Tour players - South African Richard Sterne, Australian Brett Rumford and Swede Mikko Ilonen - also clinched their spots the same way.

Joining them will be five PGA Tour counterparts who made the grade via their places in the FedEx Cup rankings.

Florida's Billy Horschel, who enjoyed his breakthrough win at the Zurich Classic of New Orleans in April and finished fourth at last month's US Open, will make his debut as will 34-year-old Jimmy Walker, courtesy of his runners-up spot at the Greenbrier Classic yesterday, and Sony Open winner Russell Henley.

Former Ryder Cup player and crowd favourite Boo Weekley returns to The Open after finishing tied-13th in 2009.

Ex-United States Walker Cup player Harris English will also play at Muirfield, having finished joint 54th at Royal Lytham and St Annes last year.

A further eight have secured had their places confirmed as the highest-ranked non-exempt players in the world golf rankings at the end of last week.

Swedish duo Jonas Blixt and Fredrik Jacobsen, Scotland's Martin Laird, Australian Marc Leishman, Canada's Graham DeLaet, American pair Kyle Stanley and Ken Duke and England's Chris Wood have all been handed spots.

American Scott Stallings is now first reserve.

There are two more exemptions to come next Monday: one from the John Deere Classic and one from the Scottish Open.