Tiger Woods arrives at Valhalla Golf Club for practice round

Tiger Woods has arrived at Valhalla Golf Club for a practice round ahead of the US PGA Championship.

The 38-year-old's participation in the tournament has been in doubt after he recently aggravated a back problem.

However, he is now thought to be in with a chance of playing the final Major of the year when it gets underway on Thursday.

Woods, who underwent back surgery earlier this year, was forced to retire from last week's WGC-Bridgestone Invitational.