CHICAGO -- Chicago Cubs outfielder Tyler Colvin is expressing disappointment his season is over early, ended by a shattered bat that wound up puncturing his chest.

Colvin was standing at third base in the second inning of Chicago's 13-3 victory at Florida on Sunday when he was struck by a sliver of Welington Castillo's broken bat. Castillo doubled on the play and Colvin scored.

A Cubs trainer said Colvin was hit in his upper chest, allowing air into his chest well and potentially into his lungs. He was being treated with a chest tube to prevent a collapsed lung and was expected to remain at a Miami hospital for a few more days for observation.

In a statement released by the Cubs on Monday, Colvin said he was doing OK, and thanked fans for their support during the season. Colvin also expressed thanks to the Cubs' and Marlins' training and medical staffs for taking care of him.