"Tomorrow, with [D-backs righty Trevor] Cahill, a heavy-sinker guy who's tough on right-handed hitters, I got 'Check' in there tonight," said Weiss, who plans to go with first baseman Todd Helton on Wednesday afternoon.
The Rockies usually don't start Helton in day games after night games, but since he's got Tuesday night off, he'll be able to make the start.
Pacheco entered Tuesday hitting .318 in 28 games, while Helton was hitting .231 in 26 games. Part of Pacheco's playing time came when Helton was hurt. With Helton healthy, Weiss must make sure Pacheco gets in ample work.
Weiss said it helps that Helton needs the down time and doesn't fight it.
"Todd's been great," Weiss said. "He understands that. He understood it coming into the season. He's still getting a lot of playing time, but he knows he needs a day here and there. That's what we try to do. 'Check' is a nice piece to have to insert into the lineup, and you can insert him in a number of different spots."
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.