"That's just my guess as things stand right now," Pelini said Tuesday on the Big Ten coaches' teleconference.
Abdullah suffered a minor sprain of the MCL in his left knee Saturday during the first quarter of Nebraska's 35-14 win over Purdue.
He rushed for 1 yard on six carries in the game, sitting out the final three quarters. His 1,250 yards in nine games rank fifth nationally, and Abdullah leads the nation in all-purpose yardage.
The No. 15 Huskers (8-1, 4-1 Big Ten) are off this week before the trip to Wisconsin that will loom large in determining the West Division title.
In the two days since Abdullah suffered the injury, Pelini said the senior has been "doing great."
Abdullah's injury, according to the coach, is less severe than the MCL sprain that caused former Nebraska back Rex Burkhead to miss six games in 2012.