CHICAGO – Cubs rookie outfielder Owen Caissie pulled off a difficult catch on Saturday afternoon, but it came at a cost.

In the wake of Chicago's 5-4 loss to the Rays , Cubs manager Craig Counsell said that Caissie had entered Major League Baseball’s concussion protocol after hitting his head on the ivy-covered brick wall at Wrigley Field. The team will continue to monitor Caissie’s progress in the coming days.

“Owen has concussion symptoms,” Counsell said. “We’ll just evaluate him moving forward. He just kind of got gradually worse after running into the wall. About 45 minutes later, he couldn’t continue.”

The 23-year-old Caissie – MLB Pipeline’s top Cubs prospect and No. 44 on the Top 100 list – was promoted from Triple-A Iowa prior to Saturday’s game. He has appeared in a doz

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