Carlos Zambrano, the three-time All-Star right-hander who’s made seven starts for various Phillies minor-league affiliates in recent weeks, is out for at least a month after an MRI showed a Grade I lat strain in his right shoulder, a Phillies spokesman said Tuesday evening during the Phillies-Pirates game at PNC Park.

Zambrano, who has won 132 major-league games, left his start Saturday for Lehigh Valley in Allentown after just two innings and was placed on the minor-league disabled list.

The team spokesman said an MRI showed no structural damage in Zambrano’s shoulder and said the injury was a result of “normal wear and tear.”

Zambrano has an option that would have allowed him to opt out of his minor-league contract and become a free agent this past Monday if the Phillies didn’t promote him to the majors, but facing at least four weeks of inactivity, he obviously won’t do that, since no other team is going to sign him while he’s not healthy.

Zambrano, 32, was 1-0 with a 3.32 ERA in four starts at Lehigh Valley. Overall, he was 3-0 with a 2.03 ERA in seven starts at Single A Clearwater, Double A Reading and Lehigh Valley.