The Dodgers recalled utilityman Enrique Hernandez from triple-A Oklahoma City and started him Tuesday, against San Francisco Giants ace Madison Bumgarner. With Yasiel Puig on the disabled list as of Sunday and rookie Joc Pederson rested against the left-handed Bumgarner, the Dodgers' starting outfield Tuesday was Alex Guerrero in left field, Hernandez in center and Scott Van Slyke in right.
Guerrero, who is batting .500 with five home runs in 22 at-bats, never has started a major league game in left field.
Crawford, 33, said he suffered the injury when he swung and hit a triple in the second inning of Monday's game. He remained in the game on defense but came out one inning later, when he could not swing a bat without pain.
Oblique injuries -- even ones in which the tear is not complete -- generally take about a month to heal.
"It's a bad tear," Crawford said, adding that he had not been given a timetable for his return.
Crawford is on the disabled list for the fifth time in four years, each time with a different injury -- wrist and elbow in 2012, hamstring in 2013, ankle in 2014 and now the oblique.
"I had plans," Crawford said. "I didn't want to get hurt, to have to go back on the DL again."
Also Tuesday, closer Kenley Jansen said he expects to begin a minor league rehabilitation assignment at Class-A Rancho Cucamonga on Friday. Jansen said he anticipates pitching six or seven innings before being activated, likely in mid-May.
Jansen has not pitched this season as he recovers from foot surgery.
Follow Bill Shaikin on Twitter @BillShaikin