American Brooks Koepka has ruled himself out of the Masters tournament, which begins next month, according to reports circulating in the United States, as per Sky Sports News.

Koepka, the current US Open champion, has been sidelined from recent events after suffering a partially torn tendon in his left wrist at the Sentry Tournament of Champions in Hawaii back in January.

Following his injury, Koepka, a native of Florida, began a series of intense treatments in a bid to regain full fitness for the event at Augusta National.

However, unfortunately for the 27-year-old, the race against time to be fit for April 5 has been lost, with medical advisors informing him that he will not be 100% right for the historic event in Georgia.

A graduate of the European Tour, Koepka, who triumphed to a four-shot win at Erin Hills last June, conceded that he will be unable to compete at full fitness when the Masters come around.

Koepka concluded the Augusta event tied in 11th position last year, and he feels that should he have risked a return to the famous greens too early, then more long-term damage may have seen the PGA tour competitor do more harm than good to his current predicament that he faces at the moment.

In quotes surfaced by USA Today, Koepka dismissed any opportunities of playing at the tournament, feeling the risk to take could be too damning.

Koepka said: "They said I would be about 80 per cent, but I can't play 80 per cent. I either have to go full bore or not at all. I don't want to risk getting it re-injured and then be out a long time."

The world number nine will subsequently focus on his recovery, and he'll be looking to return to full fitness in time to defend his US Open title in June.