Rockies catcher Michael McKenry dealing with fluid in knee

OAKLAND, CA - JUNE 30: Michael McKenry #8 of the Colorado Rockies turns to check the base runner after catching a foul pop-up off the bat of Billy Butler #16 of the Oakland Athletics in the bottom of the fourth inning at O.co Coliseum on June 30, 2015 in Oakland, California. (Photo by Thearon W. Henderson/Getty Images)

Colorado Rockies catcher Michael McKenry is usually behind the dish when Jorge De La Rosa starts, which made his absence from the lineup during La Rosa's start on Wednesday puzzling.

Manager Walt Weiss revealed that McKenry has been dealing with a knee injury that prevented him from catching on Wednesday.

"Mack is a little nicked up right now," Weiss said, per the Denver Post. "He's been dealing with some fluid in [his right knee]. But he's gotten much better in the last 48 hours."

The 30-year-old catcher, who had season-ending surgery on his left knee in 2013 as a member of the Pittsburgh Pirates, is expected to be cleared to play on Friday.

(h/t Denver Post)