"His hip is a little cranky. We decided to shut him down," Price said.
Davis has been bothered by soreness for about three weeks as he wrapped up his season at Triple-A Louisville.
"But it didn't seem to be as big of a hindrance as it was in his last game," Price said.
Davis is 1-3 with an 8.63 ERA in seven games, including six starts, over his two callups. In a 9-2 loss vs. the Cardinals on Wednesday, he allowed five earned runs and five hits -- including three home runs -- over three innings.
A 28-year-old former first-round Draft pick of the Blue Jays in 2010, McGuire is making the most of his time as a September callup. Since his big league debut on Sept. 12, he has pitched 5 2/3 scoreless innings, yielding two hits and four strikeouts over four relief appearances.
"He's been great," Price said. "He makes the most sense to start right now. We've seen him out of the bullpen. He's been very impressive. It would be nice to see him for a longer stint and get an opportunity to see what he's all about. He'll be a guy we'll certainly have discussions going into the offseason about on what type of fit he is for our club moving forward -- starter or reliever."
McGuire had bounced between Double-A and Triple-A for multiple organizations the past few seasons until the Reds signed him in February. He subsequently spent 2017 with Double-A Pensacola, going 9-9 with a 2.79 ERA in 28 games (27 starts).
"I think [it was] just challenging people and throwing strikes," McGuire said of his late-career success. "It's something I've definitely struggled with at points in my career. I think what set this year apart from those other years was just challenging guys and trying to get ahead."
The Reds like that McGuire throws four different pitches for strikes and how he competes and controls the running game.
"Maybe he's just a guy that blooms late," Price said.
DeSclafani progressing in Arizona
Injured Reds pitcher Anthony DeSclafani (right elbow) threw 64 pitches over four innings on Saturday during a simulated game with Reds instructional league players.
"He threw his full complement of pitches, all of his pitches -- fastball, slider, change," Price said. "He'll throw five innings and somewhere in the neighborhood of 80-85 pitches next time out [Thursday]. He's come through everything really well. We'll continue to take that workload and see how he holds up over the course of instructional league."