World number one Dustin Johnson has given himself a clean bill of health as he bids to win the US PGA Championship in his home state.

Johnson pulled out of last week's AT&T Byron Nelson with "knee discomfort" related to surgery he had in 2019, but will contest the year's second major championship at Kiawah Island in South Carolina.

"(My) health is good," the two-time major winner said. "I just wanted to spend more time on making sure I was feeling 100% for this week and done a lot of work at home, and yeah, I feel really good coming into this week.

"It just didn't feel right. I got an MRI. Everything was fine. It was the one I had surgery on about a year and a half ago.

"Just got together with the doctor and physio down there that I use for my rehab and just put together a little bit of a plan to get a little bit stronger."

Johnson won the US Open in 2016 and claimed his second major title in last year's Masters with a record winning total of 20 under par.

Asked where winning the US PGA ranked on his list of career goals, the 36-year-old added: "It's definitely on the top of the list of things that I haven't accomplished and something that I really would like to do. It would be great obviously to do it here in my home state.

"It means a lot. Obviously it's great coming back here to play and playing in a major. I've got a lot of friends and family and a lot of support here in my home state. So I'm really looking forward to it."