The centerfielder crashed into an infielder while trying to make a running catch during a game Thursday in New Britain, Connecticut. Had he waited for his spleen to heal, Dahl would've missed the rest of the season.
By having the spleen removed in a procedure Monday, Dahl may return in four to six weeks. His agent, Adam Karon, said that ''it was something he was willing to tackle in exchange to play again this year.''
Karon said the Rockies were supportive of Dahl's decision.
Without his spleen, Dahl will need a regular series of vaccinations to avoid infection.