GREEN BAY, Wis. — Green Bay Packers right tackle Bryan Bulaga may be unable to play this week because of a sprained left knee, and backup offensive lineman Derek Sherrod is recovering from surgery on his broken right leg.

The Packers no longer are perfect after Sunday's loss at Kansas City, and their injuries are mounting0.

The Chiefs beat the Packers 19-14, ending a 19-game winning streak. It was the Packers' first loss since Dec. 19, 2010, at New England.

It's only one loss, and it doesn't change the Packers' status as prohibitive favorites in the NFC. But the issues that came up at Kansas City do represent challenges to another Super Bowl run.

Packers coach Mike McCarthy said the team had a "very quiet plane ride home last night, and that's understandable."