Chelmsford City winger Anthony Cook will miss the rest of the season after rupturing a cruciate ligament for the second time this year.
The 22-year-old sustained the knock in a Blue Square Bet South match at Maidenhead earlier this month.
He had just returned from nine months on the sidelines with a similar injury.
Clarets boss Glenn Pennyfather said: "It's unbelievable bad luck to receive the same injury twice as he worked so hard to get back to fitness."
Cook was a key part of the club's 2009-10 campaign, scoring 10 goals, and he netted nine times in the first half of last season before picking up a cruciate ligament injury.
The former Dagenham and Redbridge winger had made five appearances off the bench in the 2011-12 campaign and was getting back to full fitness, but is now set for another nine months on the sidelines.