Peterson, a running back selected No. 7 overall out of Oklahoma, and Rice, a wide receiver taken in the second round from South Carolina, were drafted to help inject some big-play ability into a Vikings offense that fell flat in 2006.
Following the morning workout, coach Brad Childress again warned of the problems rookies can have if they fall behind in learning the scheme.
"My best advice to them would be get their tails in camp," Childress said.
Shortly after the team finished the afternoon practice, Eric Metz, one of Rice's agents, reached agreement with the Vikings on a deal. Metz said Rice was on his way to camp Friday evening and was due to join his teammates on the field Saturday morning.