Novak Djokovic is reportedly almost certain to miss the US Open at Flushing Meadows next month.

The world number four was forced to retire from his Wimbledon quarter-final clash with Czech Republic star Tomas Berdych earlier this month after picking up an elbow injury.

The Serbian was a set and 2-0 down in the second before withdrawing from the contest and the recent comments regarding his fitness do not make good reading ahead of the final Grand Slam of the campaign.

According to reports, Zdenko Milinkovic, a physician with the Serbia national team, has told the Sportski zurnal daily that the 30-year-old is 99% certain to miss the event, while revealing the former world number one will be sidelined for six to 12 weeks.

If Djokovic, who lifted the trophy in 2011 and 2015, was to miss the tournament, it would be the first time he has been absent from the US Open since making his debut back in 2005.

There has been no statement from the 30-year-old regarding the comments but a lack of information about his fitness before the recent revelation suggests all is not going well in his recovery.