Guerrero was hit by a pitch in last Sunday's game against the Red Sox, cracking a small bone in his right hand. Showalter said the 15-day count would be backdated to July 6, theoretically marking his possible return date at July 21.
The team called up Triple-A Norfolk outfielder Matt Angle to take Guerrero's roster spot. Lefty reliever Pedro Viola was sent down to Double-A Bowie, making room for left-hander Troy Patton to be summoned to Baltimore from Norfolk.
Showalter was unsure before the game if Guerrero would be placed on the DL.
"I'm sure at some point he's a DL candidate, but [we'll] get the medical people to weigh in on if it's worth waiting a day or two, or what have you, and whether it's going to get better," Showalter said.
Guerrero said that while it doesn't feel like it's getting any better, he's not in constant pain.
"It only hurts when I swing," he said. "Usually I'll take two or three days off but it's broken so it's different now," Guerrero said. "They'll check me in a little while and go from there."
Markakis on his 1,000th hit
Right fielder Nick Markakis was happy to reach the 1,000-hit milestone Friday, but the night left something to be desired.
"It would have been nice if we would have won when I'd gotten it done," Markakis said with a laugh. "It is what it is. I don't look too much into it. There's a lot of other things to worry about around here besides 1,000 hits."
Markakis became the 14th player to reach 1,000 hits with the Orioles. He did it with a third-inning single in a 6-5 loss to the Cleveland Indians.
Earlier this season, Markakis got to see Guerrero collect his 2,500th hit.
"You look at him and [New York Yankees shortstop Derek] Jeter and those types of guys, the guys who have done it," Markakis said. "I'm still a long, long ways away from them. But it was definitely [good] to get it and get it at home."
Markakis received a standing ovation after the hit. A fan favorite, Markakis was appreciative of the support.
"I feel like my relationship with the fans is great," Markakis said. "Like I said, it was nice to do it at home and in front of them. These players and myself appreciate the fans every night. I wouldn't be here if it wasn't for them."
Scott eyes Tuesday return
Outfielder Luke Scott will likely be inserted back into the lineup by Tuesday, both he and Showalter said before Saturday's game.
Scott, who has been hampered by a shoulder injury he suffered in May, will play with Double-A Bowie today. He will travel with the Baysox to Harrisburg on Monday and be in Baltimore for Tuesday's game against Boston.
"There's no guarantees, but that's the goal," Scott said.
Scott played through the injury — a torn labrum — for much of May and June before being placed on the DL on July 6. He received a cortisone shot Friday.
"We'd like for him to be able to come back and do the things that Luke's capable of doing, and hopefully pick up some slack if we have to go down that road with Vladi," Showalter said.
Scott said the shoulder feels normal but that the lack of activity is worrisome.
"I haven't turned it loose yet," Scott said. "It feels all right. The only thing is I haven't swung a bat in 12 days."
Scott has struggled this season, hitting .223 with nine home runs and 22 RBIs.
Around the horn
Starting for Norfolk on Saturday night, left-handed pitcher Brian Matusz lasted seven innings, allowing three hits, no runs and two walks and striking out eight. … Showalter said Brad Bergesen will likely start Monday's game against the Red Sox. Bergesen spent a little less than a month with Triple-A Norfolk after starting the year in Baltimore, where he was 1-6 with a 5.36 ERA in 10 games. He entered the bullpen upon his return to the Orioles. … Showalter expects Zach Britton to be back with the club by July 30. The rookie has one or two more minor league starts before then. Britton's next minor league start is set for Wednesday with Bowie. … Highly regarded shortstop prospect Manny Machado left Friday's Frederick Keys game with a hip flexor. He was not in Saturday's starting lineup but was available to pinch hit. … Showalter said the club hopes to have the suspensions of closer Kevin Gregg (four games) and reliever Michael Gonzalez (three games) cleared up by Monday. Both players are appealing and the suspensions will not be served at the same time. … Friday's loss marked the first time the Orioles have lost a one-run game at home this season. … Frederick closer Sean Gleason earned his Keys franchise-record 25th save of the season Friday night.