Jose Guillen’s disappointing second season in Kansas City has taken a bizarre twist: The Royals right fielder could miss up to 10 weeks due to a knee injury sustained while he was putting on a shin guard.

The injury happened in the second inning of Wednesday night’s 9-6 loss to the Los Angeles Angels. After playing two innings in the field, Guillen came in to get ready for his first at-bat.

While bending over to put on his shin guard, Guillen felt a pop and sharp pain in his right knee. He was immediately replaced by a pinch hitter and taken to the hospital.

The diagnosis? A partially torn lateral collateral ligament.

Guillen isn’t expected to need surgery, but will get a second opinion to make sure. The initial projection is for him to miss 4 to 6 weeks, though it could be as long as 8 to 10 weeks. The Royals placed him on the 15-day disabled list and recalled Mitch Maier from Triple-A Omaha.