Rookie outfielder Owen Caissie collided with the outfield wall during a 5-4 loss to the Tampa Bay Rays, landing him on the injured list just as the Chicago Cubs look to stay competitive. His absence adds another challenge to the team’s roster as they push through the remaining games of the season.

Chicago Cubs outfielder Owen Caissie has entered MLB’s concussion protocol after colliding with a wall on Saturday. The team now faces the prospect of managing without him for an uncertain stretch as he recovers.