MANKATO, Minn. -- Minnesota Vikings coach Mike Zimmer said he's still optimistic about a quick return for wide receiver Cordarrelle Patterson from a minor foot injury, and added he thought cornerback Captain Munnerlyn would return to practice from a hamstring strain in short order, as well. The prognosis for safety Andrew Sendejo -- who has been out since the Vikings' spring program with lower back and ankle injuries he sustained last season -- is less certain.

Sendejo still hasn't made much progress in his recovery, Zimmer said on Saturday afternoon. He was working out with Patterson during the Vikings' Saturday practice, but still hasn't had a down of practice time since Zimmer became the Vikings' coach in January.

"It's a concern," Zimmer said. "I haven't seen him one day, so I don't know really anything."

Patterson informed Zimmer about his foot injury the day before the Vikings reported to training camp, and was held out of the Vikings' conditioning test on Thursday. He's been improving since the start of camp, Zimmer said. "It won't be long," he said. "I'd be surprised if it was long [before he practiced]."

Munnerlyn, Zimmer said, should be back "in a couple more days."