Nwangwu (knee) was seen working on a side field during Wednesday's practice, Eric Smith of the Vikings' official site reports.
Nwangwu hyperextended his left knee during a preseason matchup with the Browns on Aug. 14 and was placed on IR before the initial 53-man roster deadline. The rookie fourth-round pick is eligible to come off IR as soon as Week 4, but the Vikings aren't going to rush anything because he will need to be conditioned. When healthy, Nwangwu will likely compete with Ameer Abdullah for the No. 3 running back job.