The 25-year-old injured his ankle while playing for Serbia in the Davis Cup against the United States at the weekend.

Having undergone an MRI scan, no "structural damage to the joints or ligaments" showed up, he said on his official website.

However, he added that he needed: "treatment and total rest for several days" and could not guarantee his participation at Monte Carlo.

He said a decision would be taken "depending on the development of the injury."

Djokovic won both his singles rubbers to help Serbia reach the Davis Cup semi-finals.

He won a fourth Australian Open in January, beating Britain's Andy Murray in the final, but has been off form recently, losing to Juan Martin del Porto in the Indian Wells semi-finals before falling to Tommy Haas in the last 16 at Miami.