Djokovic was forced to sit out the last six months of 2017 as he recovered from an elbow injury which required surgery shortly after Wimbledon.
The Serbian has since found it difficult to get back to top form as he suffered early exits from the Australian Open and at Indian Wells.
Djokovic has dropped to number 12 in the world rankings following his recent problem and admitted that the issue has still not completely gone away.
The 30-year-old says that he is still fighting to be 100 per cent fit and has warned supporters that he will not find his best form until later in the year.
“It felt great [to be playing again], obviously,” Djokovic told ATP World Tour.
“It is still part of this process of trying to get to 100 per cent.
“It is going to take a while because the injury I have carried for over two years has forced me to modify my game and make some compromises with certain shots in my game.
“I am actually embracing the process and trying to take my time every day.
“Every day I am trying to take a positive step to where I want to be.
“Obviously having achieved all that I have achieved I am very proud of.
“I reached the stage at the end of 2016 where I had to find my goals and try to find ways to inspire myself to keep myself going, because of the elbow.
“As long as I’m healthy that is all that matters.”