Feldman, on the DL with right biceps tendinitis, will start Friday's series opener at Baltimore, his former team. He's started three games this year, going 2-1 with a 1.69 ERA. Feldman started to feel some discomfort throwing in the bullpen after that start and became concerned because his velocity was down.
"Honestly, it feels really good," Feldman said. "I don't want to jinx it, but it feels like it's all gone. We'll see how it goes, but hopefully I can throw harder than 86 [mph] when I come back."
Albers, meanwhile, hasn't pitched since April 21 because of right shoulder tendinitis. He threw 25 pitches in the bullpen Tuesday and could be activated as soon as Wednesday.
"I look forward to getting back to being healthy and helping this team win," Albers said. "That's what I'm trying to do right now."
Astros manager Bo Porter didn't tip his hand about any upcoming roster moves -- specifically which starter will be removed from the rotation to make room for Feldman. Collin McHugh, who was called up to replace Feldman, is 2-1 with a 2.79 ERA in three starts.