Rory McIlroy's talent is not in doubt but there are questions over his physical status at the US PGA Championship, says Tiger Woods.
Tiger Woods has warned world number one Rory McIlroy that Whistling Straits will be a tough course for him to manage his ankle injury.
McIlroy will defend the US PGA Championship in Wisconsin this week, marking his first tournament since June's U.S. Open.
The four-time major winner suffered ligament damage while playing football with friends in July, missing the Scottish Open, The Open and the WGC-Bridgestone Invitational as a result.
McIlroy stated that he is 100 per cent ready to make his return, but Woods - a four-time US PGA Championship winner - believes the links-style Whistling Straits course will cause the Northern Irishman pain.
"Am I surprised that he [McIlroy] is playing? No, not really," Woods said. "He has good physios and has worked hard, it's just a matter of how long he can go like this or need to get it surgically repaired.
"It will be a tough course [for him], even the walks from tee box to fairway - they are not straight, they have got a little angulation - so it's a matter of how he holds up.
"His talent isn't a problem, it's more physically can he can do it? I blew out my knee and played for nine months before I got it fixed, so it can be done.
"Will he be in pain? Yes. Swelling will occur but that's what the physio is there for."
Woods placed tied 24th and tied 28th when Whistling Straits held the US PGA in 2004 and 2010.
With 976 official bunkers to contend with there is little room for error, but the former world number one says good play will be rewarded.
"The short holes are going to play really tricky and you have to understand how to play them," Woods added. "You have to use a lot of short irons and you get a lot of looks [at the green]. But you have to get them into the areas if you don't you're in for it.
"There's plenty of room off the tee and plenty of room on the greens, you just have to hit them."