The key is for Luck to get as much quality real-game work in before he goes to the sidelines.
"He needs to play against somebody else than ourselves and see different coverage and different fronts. [I'm] looking forward it," Arians said, adding that Indianapolis will not game plan for St. Louis.
"We practice against the Colts full speed and we play the Rams when they show up. We don't have time to prepare for another team in the preseason. We just give them a little film work, walk through some stuff and show them the basic defense and let them play football. We're still getting better fundamentally and everything else that we don't have time to game plan and prepare for another team."
Luck update -- During Monday's afternoon practice, the Colts' rookie starter connected on 15-of-29 passes with three touchdowns and one interception. His scoring passes included two to veteran receiver Reggie Wayne and one to rookie wide receiver LaVon Brazill.
Luck completed two long TDs, one each to Wayne and Brazill. The throw to Brazill covered 70 yards into the back corner of the end zone. One of the scoring passes to Wayne was drilled over the middle and split the seam between three defenders.
Updating Luck's training camp passing statistics, he has completed 165-of-232 passes for 15 touchdowns and six interceptions in 7-on-7 and 11-on-11 drills.
Brazill also completed a pass, taking the handoff from backup quarterback Drew Stanton on an end-around and then threw downfield to a wide open Austin Collie.
Injury report -- Wide receiver Donnie Avery did not practice Monday after suffering an apparent hip contusion midway through Sunday afternoon's practice. No word on when Avery will be able to resume practice, although Arians said that the former St. Louis and Tennessee is not expected to play against the Rams on Sunday.
Also sitting out Monday were outside linebacker Mario Addison, wide receiver Jarred Fayson, and cornerback Chris Rucker. Rookie cornerback Buddy Jackson and cornerback Justin King were able to return to practice.