Pittsburgh Pirates newly acquired lefthander Scott Olsen suffered a mild strain in his left hamstring and will be out for at least a week.
Olsen, who is expected to battle for the fifth starter job, incurred the injury during fielding practice on Thursday.
"We are going to take it a day at a time and a week lost is a week lost," Pirates manager Clint Hurdle said. "There is no more concern other than there is going to be a time where he is not going to be involved.
