The A's infield appears mostly set for the 2020 season, but there are still questions to answer at second base and behind the plate. Oakland could choose to bring back Jurickson Profar and Josh Phegley, or they could instead turn to the free agent market at those positions.

With that in mind, here are five infielders the A's could target in free agency:

Stephen Vogt - C

We know that the A's have already reached out to their former catcher to discuss a reunion. Vogt is coming off a strong season with the Giants, slashing .263/.314/.490 with 10 home runs, 24 doubles, and 40 RBI in 99 games.

The 35-year-old is still extremely popular in the A's organization and among Oakland fans. He would be an excellent mentor for young Sean Murphy, with the two forming a potent platoon behind the plate.

Vogt figures to earn a raise from this year's league-minimum salary of $555K but should still be affordable for the A's, if they choose to move on from Phegley.

Jason Castro - C

Castro represents another left-handed bat to platoon with Murphy behind the plate. The 32-year-old is a Castro Valley native and played his college baseball at Stanford.

Castro posted a .232/.332/.435 slash line with the Twins this season, blasting 13 homers and 30 RBI in 79 games. He is also one of the better defensive catchers in the league, particularly when it comes to pitch framing.

Castro earned $8 million this year in the final season of his three-year contract with Minnesota. He almost certainly won't get that much money in his next contract, though he may still be more expensive than Vogt.

Eric Sogard - 2B

Sogard spent his first six major league seasons in Oakland, where he became a fan favorite, thanks in part to his distinctive "Nerd Power" glasses. This season, Sogard reminded us that Nerd Power can also translate to some serious production on the field.

The 33-year-old enjoyed the best season of his career, slashing .290/.353/.457 with 13 home runs, 23 doubles, and 40 RBI in 110 games between Toronto and Tampa Bay. If the A's choose to trade or non-tender Profar, Sogard could take over the starting second baseman job and add a much-needed left-handed bat to the lineup.

Sogard earned just $555K this year and will get a significant raise in free agency. However, he could still cost less than Profar's projected $5.8 million in arbitration.

Jason Kipnis - 2B

Kipnis has spent his entire nine-year career with the Indians, slashing .261/.333/.417. This past season, those numbers dipped a bit to .245/.304/.410, but he still notched 17 homers, 23 doubles, and 65 RBI in 121 games.

The 32-year-old should still have some productive seasons in front of him and, like Sogard, he would provide another left-handed bat in the A's lineup, if Oakland decides to move on from Profar.

Kipnis just completed a six-year, $52.5 million deal with Cleveland but figures to come a bit cheaper now. The A's might even be able to snag him on a one-year contract.

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Ben Zobrist - 2B

Zobrist is 38 years old but can still swing the bat when healthy. The former A has a career slash line of .266/.357/.426 in 14 seasons, the last four coming with the Cubs.

Zobrist only played in 47 games this year due to personal issues, but in 2018, he hit .305/.378/.440 with nine home runs, 28 doubles, and 58 RBI in 139 games. The switch-hitter could provide the A's with an additional left-handed bat against right-handed pitching.

Zobrist earned $12.5 million this year in the final season of a four-year, $56 million deal with Chicago. With his age and uncertainty, he could be available for fairly cheap.

