Riley McGree is poised to join Ange Postecoglou and Tom Rogic at Celtic, with the Scottish giants emerging as favourites to sign the 23-year-old Socceroos midfielder.
Former Adelaide United star McGree is currently with United States Major League Soccer expansion club Charlotte FC after the conclusion of a successful loan spell with English second-tier side Birmingham City.
McGree had been linked with a return to England, with Middlesbrough among those reported to be interested, but Postecoglou's Celtic are now considered his most likely destination.
Several outlets in the United Kingdom have reported Celtic's interest with a transfer fee of between Stg2 million ($A3.8m) and Stg3m ($A5.7m) set to secure McGree's move to Parkhead.
Postecoglou called up McGree to the Socceroos squad in March 2017, but the South Australian was an unused player for World Cup qualifiers against Iraq and the UAE.
McGree did make his national team debut last year, coming on as a substitute in a 3-0 win over Kuwait in June.
He has since gone on to make seven Socceroos appearances and became a fan favourite during his time at Birmingham, scoring three goals in 30 appearances before his loan period ended in December.
Postecoglou has already signed Japanese duo Reo Hatate and Yosuke Ideguchi in the January transfer window, giving the Hoops boss plenty of midfield options -- including Socceroos ace Rogic -- heading into the second half of the season.
