Moody's had ankle surgery after being injured in the side's win over the Blues a fortnight ago.
He'll be out for eight weeks which means he will still be available for the All Blacks World Cup campaign in France in September.
Moody's the fourth prop the Crusaders have lost during their title defence.
The Super Rugby Pacific side has already lost Fletcher Newell, George Bower and Finlay Brewis to injuries.
The Crusaders hope to add another prop to their roster in the near future.
34 year old Moody missed much of last season with an ACL injury.