Astros manager Dusty Baker said Monday that All-Star third baseman Alex Bregman will be activated from the injured list prior to Tuesday’s doubleheader against the A’s in Oakland. Bregman has been out since straining his hamstring July 19 running the bases in Colorado.

“We’ve been really monitoring him, and he’s been trying to get back on the field,” Baker said. “He knows how much we need him, but at the same time we’ve got to take care of him. We’ve got a plan for him the next few days. We’re going to activate that plan.”

The return of Bregman comes only days after second baseman Jose Altuve went on the injured list with a right knee sprain. The team is already without slugger Yordan Alvarez (knee surgery) for the rest of the season, and the production from third base has dropped off dramatically since Bregman went down.

Bregman was hitting .272 with four homers and 14 RBIs and was riding a nine-game hitting streak following his double Aug. 19 in Colorado. He has reached base in 40 consecutive games, which was the longest active streak in the Major Leagues.

Devenski, Taylor on injured list
Two more Astros pitchers landed on the injured list Monday, with right-hander Chris Devenski and left-hander Blake Taylor both going on the shelf with elbow soreness. Devenski returned from a long IL stint on Friday and appeared in two games in Anaheim before going into Baker’s office after Sunday’s game and saying he didn’t feel well.

“We don’t know what the outcome is going to be and won’t know exactly until after he gets analyzed from the doctor,” Baker said.

Taylor, meanwhile, had not been feeling well for a while and had been trying to self-medicate, Baker said. The rookie lefty made his Major League debut this year and has been a bright spot in the bullpen, posting a 2.12 ERA in 18 games.

“As a younger player, he was afraid to go in and get treatment,” Baker said. “He was afraid of being sent out. We could tell something was wrong. His velocity was good, but his location was bad. [Catcher Martín Maldonado] said, ‘Hey, something’s not right.’ We went to him to tell us the truth. He’s not in pain; he just wasn’t right. We’re going to try to get him right before too long.”

The team called up right-handers Humberto Castellanos and Chase De Jong to fill the roster spots.

Correa, Maldonado to wear No. 21
In honor of Roberto Clemente Day on Wednesday, Astros shortstop Carlos Correa and Maldonado will both wear No. 21, Correa said Monday. Correa and Maldonado are the only Puerto Ricans on the Astros, not including bench coach Joe Espada.

Correa said it’s a dream come true to be able to wear No. 21 to honor Clemente, the Hall of Fame outfielder who died in a plane crash in 1972 while on a humanitarian mission to deliver aid to earthquake victims in Nicaragua.

“For us Latin players, especially Puerto Ricans, Roberto Clemente is our Jackie Robinson,” he said. “He was the greatest humanitarian the game has ever seen, and he did so many great things for the community, but he also opened doors for a lot of Latin players to be able to follow the dream of playing in Major League Baseball, even though we didn’t live in the Untied States. It would be an honor to be able to wear his number, and it would be a very special day.”

Worth noting
• After experiencing prolonged “pins and needles” in his right elbow after running into the wall in the sixth inning of Sunday’s game and having to be removed as a precaution, right fielder Josh Reddick was back in the lineup Monday. He had X-rays upon arriving in Oakland to make sure everything was all right.

• Altuve, who went on the IL on Saturday with a right knee sprain, hasn’t tried to test the knee with any baseball activities yet. Baker said Monday Altuve was feeling better.

• There is no update on the condition of right-handed pitcher Lance McCullers Jr., who was placed on the injured list with neck nerve irritation three days after he didn’t record an out in his start Friday in Anaheim. McCullers is in Houston to be seen by doctors.