It is linked to other legal troubles faced by the 35-year-old actor, where he was recently arrested twice for using force against his ex-girlfriend Monica Keena, reported E! online.
Furlong had been detained by cops after allegedly grabbing Monica's arm at LAX airport in October last year, then again in January after they had another argument, resulting in him facing a misdemeanour battery charge, which is still pending.
He was then arrested and jailed in February, for having broken the terms of his probation in the 2010 case brought against him by Rachael, which stated he was required to obey all laws during the three year probation period.
"Mr Furlong had the opportunity to avoid jail in a deal my office worked out which would of resolved not just this case but two other criminal cases in Beverly Hills, by checking himself into a drug rehabilitation program, a very unusual disposition in a case that alleged violence," his lawyer, Brian Michaels said.
"But sadly, Mr Furlong rejected all proposals to get into drug rehabilitation, and the court, ultimately decided that it was forced to sentence to him a hefty amount of jail time. "We are hopeful that Mr Furlong uses this experience, unpleasant as it may be, to revisit the issue of rehab when he is released," Michaels added.