ORCHARD PARK, N.Y. -- Bills quarterback Rob Johnson will miss at least four weeks after suffering a broken right clavicle in the fourth quarter of a 21-11 loss to the Patriots on Sunday, ESPN's Chris Mortensen reported.

	Johnson

Johnson was hurt during Sunday's 21-11 loss to New England. The Bills won't make any immediate moves to acquire a quarterback, coach Gregg Williams said Monday.

Johnson was not available for comment after flying home to California on Monday to attend his grandfather's funeral. Williams said he will discuss rehabilitation with Johnson once he returns.

The first part of rehab is rest to allow the fracture to heal, after which Johnson must work on strengthening his arm.

The Bills (1-7) are off to their worst start in 16 years.

"It's your starting quarterback -- I don't know how much more a significant injury it can be," Williams said.

Johnson was hurt when he landed on his throwing shoulder while being sacked by Patriots cornerback Terrell Buckley. It was the third time Johnson failed to finish a game this season, and the 11th time in 26 starts with the Bills.

Six-year veteran Alex Van Pelt will make his first start in four years next Sunday against Seattle.

Johnson's quarterback rating of 76.3 ranks eighth in the AFC.

The Associated Press contributed to this report.