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8/13/2014 11:18 P.M. ET

Alonso headed back to disabled list

SAN DIEGO -- Just over two weeks ago, the Padres saw three of their regular starting infielders -- Yonder Alonso, Everth Cabrera and Jedd Gyorko -- return from injuries within a four-day span.

Now, two of those players could be out once again for an extended period of time with nearly identical ailments.

Padres manager Bud Black confirmed Wednesday that Alonso suffered a right wrist/forearm injury during Tuesday night's 4-1 win over the Rockies and that he will be placed on the 15-day disabled list on Thursday. The Padres will announce a corresponding roster move before their game in St. Louis. Alonso could be seen on Wednesday's television broadcast in the dugout with a cast on his right arm.

Alonso returned from the DL on July 26 after missing 30 games with tendinitis in the same wrist. He was hitting .421 (16-for-38) since returning.

The news comes just one day after Cabrera was placed on the DL with a left hamstring strain for the second time in two months.

"We were looking so forward to getting Yonder, Cabby and Jedd back," Black said. "And that coincided with right after the All-Star break, as we've played well the last few weeks. It's gonna be tough here in the short-term."

In the long-term, Black is more concerned with Alonso.

"We're gonna miss those guys," Black said. "But with that said, Alexi [Amarista] did a very good job when Cabby was out. Cabby will be back. Yonder, we're not so sure of."

Alonso got another MRI Wednesday after an initial MRI Tuesday night revealed what is currently being termed as a right forearm strain.

"It's more tendon-muscle related," Black said. "But the initial feedback I'm getting from the medical department is they're concerned about this. … [Alonso] has had these forearm issues, and I'm sure they're interrelated to some extent."

Black said Alonso felt something "pop" while getting ready to bat in the fourth inning Tuesday.

"[Alonso] was fiddling and fidgeting with the bat," Black said. "Whether that was really the cause, I'm not sure. Up until then, he was fine."

Yasmani Grandal started at first base in Wednesday's 5-3 win over the Rockie, and Black said that Tommy Medica and Jake Goebbert will also see time there.

"I don't address [injuries] much in the clubhouse because we have guys in Major League uniforms who want to perform out in front of everybody to let evaluators know that they're Major League players," Black said. "And they're going to get that opportunity."

Will Laws is an associate reporter for MLB.com. You can follow him at @WillLaws This story was not subject to the approval of Major League Baseball or its clubs.