Woods has undergone three operations on his left knee

World number one Tiger Woods has provided an upbeat assessment on his recovery from knee surgery and could return to action by the end of May.

Woods underwent arthroscopic surgery in April on his left knee, but he says he may be fit to play in the Memorial tournament, which starts on 29 May.

Woods said: "If I can't play before, then hopefully at the US Open.

The US Open, the year's second major tournament, takes place between 12-15 June at California's Torrey Pines.

"The rehab is going well," added Woods. "I've been training hard. I'm getting sick and tired of riding the bike, though. I'm chipping and putting. I'm not doing anything beyond that.

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The American had hoped to achieve a Grand Slam of majors this season but his bid came to an end at the first hurdle in the Masters, which was won by Trevor Immelman.

Woods first had an operation on the knee in 1994 to remove a benign tumour and then had arthroscopic surgery in December 2002.