"You know me," he said. "I will be there in five days. I'll put some ice on it today and play catch. It will be fine."
Hernandez said he felt "a crack in my back" while throwing a pitch in the third inning on Saturday against the Rangers.
"After the inning, I told [head athletic trainer Rick Griffin] that my back was real tight. That was the first time in my career that happened."
The tightness became worse in the fourth inning and despite between-inning treatment, it got worse in the fifth inning. The Mariners' ace right-hander was replaced three batters into the inning.
"It was not me out there," Hernandez said. "I was not the same pitcher."
The "real" Hernandez went into the game with a club-record and Major League-leading 18 consecutive quality starts. But the five runs he allowed in 4 2/3 innings ended the streak.
"It was fun to have a streak like that going," he said, "but I'll just start a new one."