Daly sustained the injury at the Duff Challenge last Saturday, the PGA Tour said. He was scheduled to compete Sunday in the inaugural Bard Capital Challenge, an officially-sanctioned event on the PGA Tour Challenge Season which groups amateurs with professionals for the final round.
'Unfortunately, due to an injury, I am forced to withdraw from this year's inaugural Bard Capital Challenge,' Daly said in a statement. 'I wish Richard Bard and the entire tournament staff the best of luck with this year's event and I look forward to participating in next year's tournament.'
Daly finished 42nd on the 2005 PGA Tour money list with more than $1.75 million in earnings. A five-time winner on tour, his last victory came at the 2004 Buick Invitational.
A replacement for Daly has not been named.