Sirk previously ruptured his right Achilles and was forced to miss the 2013 season.
Duke quarterback Thomas Sirk sustained a ruptured left Achilles during a team workout on Tuesday morning, the school announced.
There is no timetable for his return, but he is expected to undergo surgery on Wednesday.
Sirk missed the 2013 with a ruptured right Achilles.
As a junior last year, Sirk started 12 games and recorded 3,428 total yards, the second most in a single season by a Blue Devils quarterback. Parker Boehme, who started one game last year, may fill in Sirk’s absence if the quarterback misses extended time during the 2016 season.
Duke finished last season 8–5 with a victory in the Pinstripe Bowl over the Indiana Hoosiers.
- Christopher Chavez