The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
Mustchin made his Scotland debut on the summer tour to Argentina last year and has been an important member of the Edinburgh team for the past 18 months.
His absence reduces Hadden's lock options although he still has first-choice pairing Jim Hamilton and Nathan Hines ready for action with some able deputies to call on.
These may include Jason White and Simon Taylor, who are both back-rowers by trade, but can play in the engine room if required.