Rangers' 15-goal top scorer has been sidelined since suffering a shoulder injury at the end of January.
There were fears the former Burnley frontman would be out for the rest of the campaign, but boss Harry Redknapp has revealed he should be able to play a part in the Championship run-in.
Redknapp said: "Charlie should be back in four to six weeks, which will be a big boost for us.
"We've just got to hang in there for as long as we can."
Rangers have certainly missed Austin after Saturday's 1-1 draw with Leeds made it five games without a win for the promotion hopefuls.