SAN DIEGO -- Matt Carpenter was due back in the Cardinals’ lineup Sunday afternoon at Petco Park after being rested for three games to regroup and work on his swing. His return to starting duty was delayed, however, when he came down with a bug that kept him out of St. Louis’ 5-3 win over San Diego in 11 innings.

The third baseman has 10 home runs this season but has a .216/.325/.381 slash line for a .706 OPS.

The illness affecting Carpenter wasn’t expected to keep him down long, and Cardinals manager Mike Shildt said he expects to have Carpenter starting again when the team begins a series at T-Mobile Park against the Mariners on Tuesday.

“Matt Carpenter is not going to sit on the bench,” Shildt said. “Matt Carpenter is a player we need to perform for us, and he will perform for us. He needs to be in our lineup to get the opportunity to perform.”

Edman impresses

Rookie Tommy Edman made his fourth straight start in the leadoff spot for St. Louis on Sunday, finishing 0-for-5 with three strikeouts. After subbing for Carpenter the previous three games, he shifted to second base on Sunday as Kolten Wong got a scheduled day off. Wong entered the game in the eighth as a pinch-hitter for Harrison Bader. Wong took over at second base in the bottom half of the inning, with Edman moving to third.

Through his first 15 big league games, Edman is slashing .273/.294/.545 with two stolen bases.

“He’s taking good at-bats, playing good defense,” Shildt said. “He’s creating more opportunities for himself.”

Notable

• Shildt said he’s still weighing how to use the designated hitter in the upcoming series at Seattle. “Obviously, Jose Martinez will be a candidate for that,” he said.

• Right-handers Mike Mayers (right lat strain) and Ryan Helsley (right shoulder impingement) each pitched an inning Saturday for Triple-A Memphis on rehab assignments.

“They were both quality outings,” Shildt said. “Looks like they both recovered well.”

Mayers allowed a solo home run. Helsley tossed a scoreless inning after failing to retire any of the four batters he saw in his first rehab appearance.