According to Breer, Bulaga already underwent surgery to repair his left knee and will likely miss six weeks.
The meniscus tear comes in addition a strained MCL which the six-year veteran sustained at practice on Thursday.
Bulaga missed all of 2013 with an ACL tear and sat out one game last year with a sprained MCL in the same leg.
He signed a five-year, $33 million deal with the Packers in the off-season.
The Packers and Seahawks meet in a rematch of the last year’s NFC championship game at 8:30 p.m. ET Sunday on NBC.
- Kenny Ducey