It will be just the fifth start in 18 days for Kottaras, who has seen his playing time dwindle with the emergence of catcher Jonathan Lucroy.
"Two things, [Lucroy] has struggled a little bit with the balls in the dirt with Manny and we will see how George does with that," Macha said. "And George impacted the game [Thursday] night, too."
Kottaras blasted a two-run homer in the series opener with the Cardinals. Although Kottaras is batting .209 entering Friday, he has an .812 OPS on the strength of patience at the plate and his power.
Kottaras has walked 27 times in 36 games, and 15 of his 23 hits have gone for extra bases. His on-base percentage sits at .357 with a .455 slugging percentage.
"His swing is similar to Prince [Fielder]," Macha said. "He is trying to hit the ball far. I don't know if he has got any hits to [the opposite field]."