Less than a week after undergoing hip surgery Andy Murray has begun his quest to be fit for the grass-court season.

The former world number one withdrew from the Australian Open on January 4 after weeks of speculation about his fitness.

Murray has been absent from the ATP World Tour with the pelvis problem since Wimbledon, the Briton's last competitive clash a quarter-final defeat to Sam Querrey on Centre Court.

He underwent surgery last week and immediately set his sights on returning after the clay-court season.

In order to meet that target the 30-year-old is already back in the gym, posting two videos on his Instagram account labelled 'Rehab day 1'.

Murray is initially shown pedalling on a stationary bike, before another clip of him lifting weights in front of a mirror.

While Murray works away in the gym, his ATP rivals will begin the battle for the Australian Open title in Melbourne next week.