EDEN PRAIRIE, Minn. — Xavier Rhodes is taking things "day by day" with a knee injury, the Vikings cornerback said Monday.

Rhodes thought he had worked his way back from a hamstring injury suffered during the preseason and would be ready to open the regular season, but he felt a pop in his knee while stretching.

"I was just stretching it out, and it just didn't feel quite right," Rhodes said. "Being out for a couple of weeks, and then I was excited about coming into the season and ready to play in the first game in the season. It didn't turn out the way I wanted it to turn out, so I was pretty upset about it."

Second-year pro and fellow first-round pick Trae Waynes started in place of Rhodes and led the Vikings with 12 tackles, including 11 solo (by coaches' tally), in Minnesota's 25-16 win at Tennessee.

"[Vikings athletic trainers] know everything. They've got all the details," Rhodes said during open locker room Monday. "I just did what I had to do, go to the MRI and get the MRI. They're going to explain everything to me later. Basically I'm just getting the rehab. I'm just working on it."

Vikings Head Coach Mike Zimmer said Rhodes "doesn't need surgery, so we'll just take it day to day."

As for Waynes, Zimmer said, "I think he's doing good. He continues to get better and get more playing time, so I feel good about where he's at."