"The Pittsburgh Pirates have reached agreement with free-agent left-hander Scott Olsen on a one-year contract, a baseball source told ESPN.com. Olsen will earn a base salary of about $500,000, and could make an additional $3 million in incentives based on starts.

The deal includes a 2012 club option for about $4 million, the source said.

If healthy, the 26-year-old Olsen is expected to fill a spot in Pittsburgh's rotation after Paul Maholm, James McDonald and the newly acquired Kevin Correia. "