The Marlins will recall left-hander Michael Tejera from Triple-A
Albuquerque to start Saturday at Tampa Bay.
Beckett felt pain while throwing for a second consecutive day
Wednesday. He visited a physical therapist Thursday, hoping a deep
tissue massage would help.
He plans to resume throwing Friday but doesn't know when he will
return to the rotation.
"The worst thing for me to do is pitch and blow it out," he said.
Beckett (4-4, 3.86 ERA) left a June 17 game against the Chicago White Sox in the fourth inning after feeling a "pop" in his back.
It was his first start since returning from the 15-day disabled list because of a blister on his right middle finger.
His move to the DL will be retroactive to June 18.
"I've stopped being optimistic, I've stopped being
pessimistic," Beckett said. "I'm just going to do what they tell
me to do. They told me to take the time now or go back out there
again and it will end up being an all-year deal."
Tejera was 6-1 with a 3.58 ERA in 14 starts at Albuquerque.