SAN DIEGO – The sagging D-backs offense won’t be able to add Jake Lamb as a reinforcement in the immediate future.

Lamb’s progress from a left quadriceps strain shifted into neutral during the team’s visit to San Diego. He put an end to running drills on Tuesday when the leg didn’t feel quite right, a move manager Torey Lovullo said was a precaution to prevent a setback.

“He’s still progressing; he’s doing well,” Lovullo said Wednesday before Arizona's 5-2 loss to San Diego. “He was neutral with a couple running exercises. I don’t want to say that he took a step backward, but he felt a little bit of weakness and stopped what he was doing. It was a neutral day. It wasn’t a progressive day, like he’s been having. It’s not terrible news.”

• Box score

Lamb last played on April 3. Arizona could use the corner infielder’s power against right-handed pitching, as it has scored three runs or fewer in 10 of 15 games coming into Wednesday while going 5-10 in that stretch. First baseman Christian Walker has batted .160 with one home run and two RBIs during those 15 games, and third baseman Eduardo Escobar has hit .217, though he does have four homers and 11 RBIs.

Additional injury updates

• Left fielder David Peralta was out of the lineup Wednesday because of right shoulder soreness. If the issue persists, he likely will have an MRI, Lovullo said.

• Infielder Wilmer Flores returned to Phoenix for an MRI exam, which revealed a small fracture to a bone near the top of his right foot, Lovullo said. “I don’t have a timetable,” Lovullo added, “but with a broken foot, it’s going to take some time to heal.”

Notable

• Lovullo will not be with the club on Friday at San Francisco in order to attend his son Connor’s high school graduation. Bench coach Jerry Narron will have the managerial reins.

• Ildemaro Vargas, recalled from Triple-A Reno to replace Flores on the roster, was in the D-backs' lineup as the leadoff batter and second baseman Wednesday. He’ll be used as he was during his earlier stint with Arizona, splitting time with Ketel Marte at second and seeing action at third when Escobar gets a breather.

“He’s just a good baseball player,” Lovullo said. “He has a ton of energy.”