The Serb recently returned to the tennis court after missing the latter stages of 2017 with an elbow injury.
After reappearing at the Australian Open in January, the 30-year-old spent another short amount of time on the sidelines to nurse the problem.
But since his full return, Djokovic has struggled.
The former world No 1 was dumped out in the first round of both the Indian Wells Masters and the Miami Open to Taro Daniel and Benoit Paire respectively.
Meanwhile, Federer has enjoyed an impressive comeback from injury, winning the Australian and Rotterdam Opens this year.
And Greg Rusedski believes not every tennis great can return in the same fashion as the Swiss star.
“I am not really concerned about Djokovic,” Rusedski told Sky Sports.
“I think he will be back once he feels fit again and is mentally there and gets the matches in.
“I wouldn’t be surprised to see the old Djokovic back [to his best] possibly before the French Open or for Wimbledon.
“You don’t just lose it, being such a great player. It’s mental but it is also physiological because at times it looks like he is getting tired when historically we have never seen him look fatigued.
“But when you have been away from the game it does take that little longer.
“We are not all Roger Federer!”
Federer now plans to skip the clay court season to save his body for the summer tournaments.
But Djokovic intends to continue playing events ahead of the French Open in May.
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