Jansen, who has recovered from an irregular heartbeat, struck out two in a hitless inning during a Minor League rehab outing for Class A Rancho Cucamonga Tuesday night, duplicating his Sunday night outing.
Lindblom will return to the big league club 10 days later when the Minor League season ends, because rosters will have expanded on Sept. 1.
Mattingly said shortstop Dee Gordon, disabled with a bruised shoulder, is expected to play two games in a Minor League rehab assignment Thursday and Friday, and could be activated Saturday.
"He looked better yesterday," Mattingly said of Gordon, whose swing was tentative Monday. "We just want to make sure he's comfortable. I feel like he was letting it go, but he has to be able to slide, do everything, so it could be a day later."
Although Justin Sellers was called up to replace Gordon, Sellers has played well, so Gordon's return could place Eugenio Velez in jeopardy. Velez, despite his defensive versatility, is 0-for-26 at the plate.
Casey Blake returned to the lineup Wednesday after missing six starts with a pinched nerve in his neck.
Mattingly said he gave slumping right fielder Andre Ethier Wednesday off against left-handed starter Jaime Garcia, but he will return to the lineup Friday night. Ethier is 2-for-27 on the trip.
"He hasn't been fighting himself too bad lately," Mattingly said of Ethier. "I know his knee barks now and then. With tomorrow off, it will be good to get him a couple days."