This morning, head coach Mike Zimmer downplayed any concern about left tackle Matt Kalil, who underwent offseason surgery on both knees.

Kalil had his knees scoped in January by Dr. James Andrews, according to a USA Today report. He also received injections to help with his joint pain. The report added that in March he underwent a procedure called Regenexx in which blood was removed, processed and re-injected into his knee. Kalil also underwent platelet-rich plasma therapy.

Zimmer didn’t go into specifics about Kalil, but did he acknowledge that the 25-year-old went through knee surgery for a second straight offseason, saying that it was “more of a clean-up kind of thing.”

"Matt’s told me that this is the best he’s felt since his rookie year, I think," Zimmer said. "So we’re just going with that. He said he feels great. And, you know, we’re glad that we got the issues taken care of."

Last spring, Kalil did not participate in team practices as he worked his way back after knee surgery. He was ready by training camp, but he struggled during the season. The 2012 first-round pick has said the knee troubles and missed practice time last spring affected his confidence.

Beyond Zimmer’s comments this morning, it's clear the Vikings aren't overly concerned about Kalil's knee issues. They picked up Kalil's fifth-year option on Monday, keeping him under team control through 2016.

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