It was believed when the Astros traded Carlos Lee to the Marlins on July 4 that Wallace would replace him at first base, but he remains at Triple-A, where he entered Monday hitting .286 with 13 homers, 46 RBIs and a .357 on-base percentage for Oklahoma City. Wallace hit .333 in 11 games with the Astros earlier this year.
"Brett will spend the vast majority of the remainder of the season in Houston," Luhnow said. "Right now, there are a lot of moving parts between injuries and guys coming back from injuries and other things that may or may not occur the rest of this month. We haven't made the decision to do it right now, but I would suspect Brett will spend the bulk of the season in Houston."
Luhnow met with Wallace while in Oklahoma City last week and has even spoken to his agent, Dan Lozano, about the situation.
"[Wallace] has maintained a positive attitude throughout, which really speaks volumes," Luhnow said. "He continues to go out there and play. He's getting quality at-bats against good competition. I'm not too concerned about hampering his development.
"Obviously, I think he's capable of helping us win some ballgames, but I feel good about the guys we have on the roster right now. There's a lot of scenarios [in which] he comes up in the not-too-distant future and spends the rest of the season with us."