'I felt better as it went on, ' Murray said.
"And also I just want to enjoy playing again".
The Scot - a two-time champion in Brisbane - did play one set against Roberto Bautista Agut at the Mubadala World Tennis Championship on Friday, losing 6-2. I'm just hoping I can get back to a level where I'm able to be really competitive.
Murray has not played competitively since losing to Sam Querrey at Wimbledon in June previous year because of a hip injury. "The rest of my body feels really good".
Fifth-seeded Johanna Konta reached the quarterfinals with a 4-6, 6-1, 6-4 win over Ajla Tomljanovic and Alize Cornet advanced with a 6-1, 7-5 win over Mirjana Lucic-Baroni.
I'm very disappointed to be withdrawing from the Brisbane International.
"Obviously continuing rehab is one option and giving my hip more time to recover", Murray wrote in an Instagram post.
The British number one, who has slipped to number 16 in the world rankings during his absence, is still scheduled to compete at the Australian Open, which begins on January 15.