By FOX Sports staff
The 32-year-old had a forgettable two-year spell at Old Trafford, where he made just 22 appearances in all competition, but has thrived since leaving the Barclays Premier League giants.
Following further stints in England with Sunderland and QPR, Miller joined Scottish side Hibernian for two seasons before moving to Australia in 2011 when he signed for Perth.
And after two years at the NIB Stadium, the central midfielder has decided to pack his bags and move to Australia's east coast by agreeing to join the Roar on a free transfer.
"I'm very happy to be joining a club with such a strong football culture both on and off the pitch," he said on the Football Federation Australia's (FFA) official website.
"My family were a huge part in my decision to sign for Brisbane and the close-knit nature of the playing group and the whole club made that decision easier for me."
Miller becomes Mike Mulvey's first signing since he took over the reins at Brisbane and the English-Australian tactician expects his new man to play an integral role his engine room for the 2013/14 season.
"On behalf of the club, I'd like to welcome Liam to Brisbane and say we're very excited to have him on board with us," he said.
"I see Liam as a key piece to our midfield puzzle - he brings experience and poise and a good work ethic.
"I can't wait to see how he combines with the talent we already have here at Brisbane Roar."
Miller earned his first cap for Republic of Ireland in 2004 and made 21 appearances for his country in total.