Defending champion Phil Mickelson and Tiger Woods were both listed on the PGA Championship field but their appearance in Tulsa, Oklahoma, next week for the year's second major remains up in the air.

Mickelson announced in February that he was taking a break from golf after inflammatory comments he made about the Saudi-backed golf league surfaced while Woods has competed once, at last month's Masters, since his February 2021 car crash.

The two golfers appeared on the preliminary PGA Championship field list released two weeks ago and the fact that their names were on Monday's full field list does not imply that they have committed to being in Tulsa next week.

Mickelson's public image took a hit when the author of an unauthorised biography on the six-times major champion said the golfer told him he was willing to look past Saudi Arabia's human rights record to gain leverage with the PGA Tour.

Saudi Arabia's government has denied accusations of human rights abuses and Mickelson later apologised for the comments, which he claimed were off the record, and then said he planned to take time away from the sport.

Mickelson became golf's oldest major champion at last year's PGA Championship when, less than a month shy of turning 51, he held off Brooks Koepka and Louis Oosthuizen to triumph by two shots at Kiawah Island's Ocean Course.

Woods, who nearly lost his right leg following a car accident last year, returned to action at last month's Masters where he opened with an encouraging one-under-par 71 but went on to finish 13 over for the week and in 47th place.

The 15-times major champion has already said he planned to play the British Open at St. Andrews in July. While he has not revealed his decision for the PGA Championship, he did play a practice round at Southern Hills last month.

The last time the PGA Championship was held at Southern Hills was in 2007, when Woods triumphed by two shots to win the event for the fourth time but the layout has since undergone a dramatic renovation.