Mariners ace Felix Hernandez, originally expected to be out two weeks with a strained right calf, is now expected to be sidelined another four weeks after undergoing a second MRI.

The team initially hoped that Hernandez would miss only two starts after being placed on the DL on June 1. But Hernandez told ESPN's Marly Rivera on Saturday that while the second MRI showed improvement, the Mariners' medical director, Dr. Edward Khalfayan, wants him to rest the calf for four to six weeks.