New Orleans Saints lineabcker Jonathan Vilma had missed several days of practice in recent days and went for a second opinion on an undisclosed injury.

That injury is now disclosed, as Adam Schefter of ESPN reports that Vilma is undergoing knee surgery today in Philadelphia.

Vilma will be out for the entire preseason, but is expected to be back in time for the regular-season opener.

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Terry McCormick covers the Titans for TitanInsider.com