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8/17/2014 8:05 P.M. ET

Alonso out for season with forearm injury

Tests reveal torn tendon for Padres first baseman; surgery a possibility

ST. LOUIS -- Yonder Alonso's season is finished after tests Saturday revealed the Padres first baseman has a torn tendon in the top of his right forearm.

Alonso, who missed 30 games from late June into late July with right wrist tendinitis, was removed from Tuesday's game when he felt a "pop" in his right forearm while preparing to hit. He was placed on the disabled list with a right forearm strain, but after meeting with doctors in San Diego on Saturday, the prognosis proved to be worse.

While Alonso will miss the remainder of the season with the tendon tear, the next step remains uncertain.

"There's a chance of a potential surgery, he's weighing those options now," manager Bud Black said. "Collectively with the doctors and Yonder, he's working through some decisions."

Black had not yet had a chance to speak with Alonso, but speculated Sunday that a second opinion would likely be in his future before any decision is made on whether to undergo surgery.

That decision is complicated by the type of injury, which Black called "a rare one."

Since returning from the disabled list July 26, Alonso had hit .421 (16-for-38) with two home runs in 15 games. The forearm issues appeared to be behind him until the freak incident Tuesday.

"He went on the DL because he was having difficulty," Black said. "When he came back, though, he was good. He said he was 100 percent, he was fine. Then just that freak incident on the steps, when he was about to go in the on-deck circle, something happened. He had the bat in his hand and he felt something in his forearm just right at that moment."

Tommy Medica started at first base in the first two games in St. Louis and Jake Goebbert started the final two. The two are expected to split time there the remainder of the season.

Goebbert steps up in second taste of Majors

ST. LOUIS -- Jake Goebbert has received a chance to showcase himself at first base, and the Padres rookie didn't disappoint.

After hitting .250 (12-for-48) in his first stint with the Padres from late June to late July, Goebbert has surged in his most recent stint, which began with three straight pinch-hit appearances Wednesday through Friday.

Starts on Saturday and Sunday provided a bigger opportunity, which Goebbert delivered upon. He provided a three-run triple in Saturday's 9-5 win and went 3-for-7 overall with five RBIs in two starts at first base.

"He's conducting good at-bats," manager Bud Black said. "He might be a little bit more comfortable coming back now that he was here one time prior. That seems to happen with a lot of players. Once they get here and do get sent back, when they do come back they're more relaxed. Jake might be in that place."

Goebbert, whom the Padres acquired in May in a trade with the A's in exchange for Kyle Blanks, hit .296 with 14 home runs and 60 RBIs in 79 games at Triple-A this season.

With first baseman Yonder Alonso out for the season with a torn tendon on top of his right forearm, Goebbert could continue to receive playing time at first base. He split the four-game weekend series there with Tommy Medica.

The reason for the recent success might not stem far from his manager's speculation.

"I think just the comfort in knowing the team, knowing the coaching staff [has helped]," Goebbert said. "I feel a lot more comfortable in my day-in and day-out routine, which allows me to put a little better performance on the field."

Worth noting

• Following a rehab outing Wednesday at Triple-A in which he threw 68 pitches, Andrew Cashner is expected to throw around 80 for El Paso on Monday. That will likely be his final hurdle before returning to San Diego after being on the DL since mid-June with soreness in his right shoulder.

• Reliever Joaquin Benoit was unavailable Sunday, manager Bud Black said. With Monday's off-day, Benoit was given the additional rest after throwing three times in five days before the team arrived in St. Louis.

Jedd Gyorko became the franchise leader for home runs by a second baseman (31) Saturday when he launched a grand slam to lift the Padres in a 9-5 win against the Cardinals.

Alex Halsted is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.