The 21-year-old was stretchered off with the problem after 65 minutes in Talinn. The unfortunate moment came when he got the studs stuck in the turf when challenging Siim Luts for possession.
A torn ACL usually means at least six months on the sidelines, but hope can be taken from Napoli striker Arkadiusz Milik‘s return to contention just four months after picking up a similar issue in October.
Pjaca has managed just three Serie A starts this season, making a further 11 appearances off the bench. He missed 14 Juve outings earlier in the season due to a leg injury, resulting in a stuttering start to his Italian career since shifting from Dinamo Zagreb for €23 million last summer.