It is understood that the 56-times-capped lock suffered a tear in the bicep of his left arm, a relatively rare injury in rugby. While not at the most serious end of the spectrum, it is likely to keep him out of action for the next four months, a development that will come as a blow to the club ahead of their two inter-city matches with Edinburgh over the next eight days and to his country, too.
"We are all gutted for Al to be missing out on playing for the next few months, but especially the 1872 Cup games," said coach Gregor Townsend. "He has played a prominent role in these games over the last few seasons and thrives against Edinburgh."
It was also confirmed Mark Bennett, the Warriors centre, suffered a fractured toe while playing for Scotland 7s in South Africa. The injury is expected to keep him on the sidelines for a number of weeks.