"It's got to be 100 percent," Kendrick said. "I don't know yet. Obviously, I want to be back out there, but if the leg's not there ... we just have to wait and see."
Kendrick, batting .500 in 36 at-bats, has been hitting in the cage "since Day 1," he said. He's been testing the hamstring with sprints and agility drills on the Angels' road trip.
He said he "still feels it a little bit in there," but is hoping he'll improve enough to be back in the lineup soon, if not on Tuesday night against the A's at Angel Stadium.
"He ran full speed," manager Mike Scioscia said before Sunday night's game against the Tigers. "There's a little fatigue in there, minimal discomfort. Hopefully, we'll know by tomorrow where he is moving toward Tuesday.
"We're optimistic it's going to be short-term. If it's not Tuesday, it will be day-to-day after that. Hopefully [he'll be back] in a couple days."
Kendrick jammed his right thumb swinging the bat on April 7 against Fausto Carmona of the Indians and missed three games. He came back and went 6-for-8 in two games against the Mariners in Seattle before straining the hamstring running out a double on April 13.
In Kendrick's absence, Maicer Izturis has filled the void at second base, with Erick Aybar at shortstop. Izturis drove in two runs with a double on Saturday and is batting .188, emerging from an early slump.
Middle reliever Chris Bootcheck was back with the club after he was forced to remain in his hotel room for two days with a fever. He's not sure how he became ill, but thinks it could have something to do with using the same weight-room facilities as the Red Sox in Boston. Many of the Red Sox players have been suffering from flu-like symptoms.
Lyle Spencer is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.