"The Sox are in a holding pattern with two-fifths of their starting rotation.

Jon Lester and Clay Buchholz underwent medical examinations yesterday, and the future of both won't be determined until next week's All-Star break.

Lester underwent a physical examination by team trainer Mike Reinold and had an MRI yesterday, both of which confirmed that he has a strained left latissimus dorsi.

"He will be treated with a period of rest from throwing, followed by (a) progressive strengthening program," team physician Tom Gill said in a statement. "There is no specific time frame for his return at this time. His status will be better defined following the All-Star break."

The Sox already were considering giving Lester extra rest before and after the break before the injury. Their hope is that he'll be ready to return when his time on the disabled list is up."