Tiger has no idea when he will return

World No 1 Tiger Woods said on Monday he is making very slow progress recovering from surgery for a pinched nerve and is unsure when he will make his return to golf.

Woods updated his status on his website, saying he remains sore after the operation and regrets not being able to defend his title at the US PGA Players Championship this week.

"It's tough to miss any tournament, but especially one that's so important to the players and where I'm defending," said Woods, who has been unable to resume his workout regimen because of the March 31 operation, which kept him from playing in last month's Masters.