The Minnesota Vikings won't name a starting quarterback until Sunday, but Sam Bradford may have a greater chance to start than initially believed.

Minnesota traded a first-round pick to the Philadelphia Eagles for Bradford last weekend.

According to Vikings assistants, Bradford has been cramming to learn the club's offense and he's learning "extremely quickly."

"He's had to learn a number of offenses in the past few years, and he's picking it up extremely quickly," assistant coach Pat Shurmur said. "We're going to do things to help him, but for the most part, we've been very impressed with how far he's come in just a few days."