Raised in Glasgow, Al is returning to his home city, while the Reivers seem set to strengthen their own local identity by signing Dumfries-born Craig.
Sean Lineen has said that finding players who would set an example has been a key consideration in his recruitment drive.
"We've got some real quality in our squad but we are not over-loaded with leaders and every team needs them," he told The Herald. "Al is a Glasgow lad and he'll fit in. I think he is an ambitious individual and he wants more responsibility.
"We've got to toughen up and Al will be an integral part of that process. I don't think our set-piece has been doing us justice so, as well as one more back, I am hoping we will sign two more forwards before the end of the month."