Tiger Woods has until his 8:35 opening tee time to inform the PGA whether or not he is fit enough to compete in this year's US PGA, The Daily Telegraph reports.
The 14-time Major winner suffered a recurrence of the back injury that forced him to miss both the Masters and US Open earlier this year when he played a shot from an awkward lie on the second hole of his final round of the WGC Bridgestone Invitational last week.
Despite attempting to play on through the pain at the ninth following his tee shot, the 38-year-old former world number one was evidently in severe discomfort and withdrew from the tournament immediately.
Ever since that moment, the world of golf has been waiting to hear whether Woods will tee it up at Valhalla this week for the season's final Major championship - but that wait looks set to go on following the PGA of America's announcement.
Their official Twitter account declared last night: "Deadline to registering for the PGA Champ was 5:00pm ET today, unless player notified the PGA he would be registering late.
"Any player in the PGA Champ who notified the PGA has up until his tee time in the opening round to register.
"The PGA of America was notified that Tiger Woods would not be arriving on site before the 5:00pm (ET) deadline on Tuesday."
It's not surprising that Woods is leaving himself until the last minute to decide on playing; he has missed the majority of the season through injury and needs a win a to get into the FedEx Cup playoffs, which will in turn give him the opportunity to impress US Ryder Cup captain Tom Watson.
The 64-year-old America admitted the problem's Woods was suffering from in his lower back "did not bode well right now".
If he eventually decided he was not fit enough to compete, it would effectively signal the end to the world number 10's PGA Tour season.