Updated

The Minnesota Vikings expect star running back Adrian Peterson to be recovered from left knee surgery for two torn ligaments in time to start the 2012 season.

Peterson tore his ACL and MCL when he was hit in the side of the knee by Washington Redskins safety DeJon Gomes in the third quarter of Saturday's 33-26 win at Washington. An MRI on Saturday evening revealed the ligament tears and meniscus damage. Peterson will undergo surgery within the next seven to 10 days, according to Minnesota head trainer Eric Sugarman.

Sugarman outlined an eight-to-nine-month recovery for Peterson, who was signed to a seven-year, $100 million contract extension before the first week of the season.