Veteran right-hander Carlos Zambrano will be out for a month with a lat strain, the Philadelphia Phillies announced.
An MRI revealed the injury after a shoulder problem surfaced in Zambrano's last start in Triple-A.
Signed to a minor league contract last month that gave the Phillies a July 1 opt-out date, Zambrano will be shut down while the injury heals. The Phillies were hoping he might be able to rejuvenate his career and provide another arm for their rotation.
Zambrano had posted an impressive 2.04 ERA in seven minor league starts spanning 35 innings, but his fastball was only clocked in the high 80 mph range and a cause for concern.
The 32-year-old last pitched in the major leagues for the Miami Marlins in 2012, posting a 7-10 record with a 4.49 ERA in 20 starts and 35 games. He spent the first 11 years of his career with the Chicago Cubs and compiled a 125-81 record.