The Atlanta Falcons may be celebrating their Week 1 victory over the Green Bay Packers but they are also dealing with a loss.

Reigning NFL sack leader Vic Beasley Jr. will miss at least a month of action because of a hamstring tear, per ESPN.

Beasley was injured during Sunday night’s tilt against the Packers, exiting the field under his own power early in the third quarter and looking visibly upset on the sideline shortly thereafter.

Beasley had a big game against Green Bay, registering two sacks, two quarterback hits and a forced fumble in the 34-23 win.

Beasley, who had a league-high 15.5 sacks last season, will create a big hold on the defensive side of the football for the Falcons, who will likely lean on first-round draft pick Takk McKinley to help.

“I did both [rushed from both sides] in college and when I got here, it was mostly right,” McKinley said. “I’m pretty sure in practice I had a few reps on the left side. It’s just getting back adjusted and getting ready to rush on both sides.”

Atlanta will also rely on Adrian Clayborn or turn to 37-year-old veteran Dwight Freeney to help during Beasley’s absence.

“I play one way, and I just do my job,” Clayborn said. “That’s all I know what to do.”