He said he is confident that if Roberts, who has played just 17 games this season, feels fine after two games, then that would be enough for his return potentially on Monday in New York.
Roberts, coming off more than a year layoff due to concussion issues, batted .182 in 17 games for the Orioles -- all at leadoff.
Since Nick Markakis came off the DL on July 9, he has been the club's leadoff hitter and has excelled, batting .359 with a .414 on-base percentage in 15 games.
Showalter said he's not going to worry about who bats leadoff if Roberts returns, but basically said that Roberts is a leadoff hitter whereas Markakis can hit throughout the lineup.
"That's a fair question but I'm going to wait to answer it until after two games in Aberdeen," Showalter said. "And what they tell me and what Brian thinks. He obviously has the most experience and like I said Nick is capable of hitting anywhere in the order in my mind where Brian is not."
The Orioles could have a crowded infield this upcoming week, because Robert Andino (left shoulder) is playing Sunday and Monday at Norfolk. If all goes well, he'll be ready to come off the DL on Tuesday.
Orioles designated hitter Jim Thome was not in Saturday's lineup. He is dealing with neck spasms, which Showalter said he learned about Saturday. Thome, 41, has been dealing with back issues for years and Showalter said Thome will be examined today to see if the neck issue is separate or if it is related to the back.
The Orioles also learned today that outfielder Steve Pearce, whom the club designated for assignment on July 21, was claimed off waivers by the Houston Astros.
Pearce batted .254 with three homers and 14 RBIs in 28 games for the Orioles.