The Rangers midfielder, who has been sidelined since suffering a serious knee injury in November last year, is on course to return to the team before the end of the season, according to head physio Paul Hunter.
"In terms of the timescale we set for Gavin, he is halfway through that now," said Hunter.
"His return date comes down to how he responds to the treatment but he seems to be on track for an April comeback.
"We've raised his regime and he's responded well so far.
"We'll have a better idea on him in a few weeks when we see how he is progressing."