Harris underwent left thumb surgery Tuesday, Jason Burke of SI.com reports.

EDGE Analysis

It's not clear exactly when Harris hurt his thumb, nor is it known the specific type of procedure he had. Harris is expected to be ready to go for the beginning of spring training, and assuming that happens he'll enter camp with a chance to win a starting job in the Athletics' infield. The 27-year-old slashed .274/.349/.342 with zero home runs over 84 plate appearances during his time with the big club in 2025.

Harris isn't in the lineup for Saturday's game against the Royals.

EDGE Analysis

After having his four-game hitting streak snapped Friday, Harris will retreat to the dugout to begin the Athletics' penultimate regular-season contest. Darell Hernaiz will slide over to third base as a result, clearing second for Max Schuemann.

Harris is out of the lineup for Sunday's game against the Pirates.

EDGE Analysis

Harris is on the bench for the third time in four matchups against a right-handed starting pitcher. With the Athletics bringing Max Muncy back from the injured list Saturday, Harris doesn't look as though he'll have a path to an everyday role in the final week of the season.

Harris is not in the lineup for Friday's game in Pittsburgh.

EDGE Analysis

After starting three straight games at third base earlier this week, Harris has now been held out of the lineup in back-to-back contests. Darell Hernaiz will play the hot corner and Zack Gelof will handle second base in Friday's series opener. Harris and Gelof could continue to former a quasi-platoon down the stretch, though it will be difficult to know ahead of time which of the two of them is going to start since they both bat from the right side of the plate.

Harris will start at third base and bat ninth in Wednesday's game against the Red Sox.

EDGE Analysis

Harris will be included in the starting nine for the third contest in a row after going 5-for-7 with a double over his previous two games. The Athletics appear set to give Harris another look as their everyday third baseman, allowing Darell Hernaiz to shift over to second base in place of the slumping Zack Gelof, who will hit the bench for the third game in a row after striking out at a 36.4 percent clip since the beginning of September.

Harris is out of the lineup for Monday's game against the Cardinals.

EDGE Analysis

Harris had been seeing fairly steady playing time at third base following his call-up from Triple-A Las Vegas on Aug. 15, but he appears to have faded into a reserve role in the wake of fellow infielder Zack Gelof getting a promotion last Monday. With Gelof starting at second base in all seven of the Athletics' games since his call-up, Darell Hernaiz has shifted over to third base on a more frequent basis.

Harris isn't in the lineup for Saturday's game against the Rangers.

EDGE Analysis

Harris will miss a second consecutive start since going 2-for-3 with a walk and three runs scored during Wednesday's game against Detroit. Darell Hernaiz will get the nod at third base instead and bat eighth.

Harris is out of the lineup for Saturday's game against the Mariners.

EDGE Analysis

Harris will take a seat Saturday for the first time since being called up Aug. 15, opening a start for Luis Urias at third base. Harris is 5-for-24 (.208) with four runs scored and three RBI since the promotion.

Harris will start at third base and bat eighth in Sunday's game against the Angels.

EDGE Analysis

After going 2-for-6 with two walks, two runs and an RBI in the first two contests of the series, Harris will remain in the lineup for a third straight game since being called up from Triple-A Las Vegas. So long as he continues to deliver productive at-bats, Harris will likely hold down the fort at third base until Max Muncy (hand) is cleared to return from the injured list.

The Athletics recalled Harris from Triple-A Las Vegas on Friday.

EDGE Analysis

Harris will make his 2025 MLB debut if he gets into a game, as he's spent the entire season at Triple-A. The 27-year-old has slashed .282/.369/.500 with 12 home runs and seven stolen bases across 252 plate appearances for Las Vegas. He'll take Gio Urshela's spot on the active roster and should have an opportunity for regular playing time while Max Muncy (hand) is sidelined.