"Uncalled for, unprofessional, no need to do it," Trembley said after discussing the incident with Cabrera and later holding a team meeting, the tenor of which he declined to discuss with reporters.
Dugouts and bullpens emptied in the fourth inning on Friday night, when Cabrera balked home Coco Crisp to give the Red Sox a 3-0 lead and his next pitch to Pedroia went behind the second baseman's ear. That precipitated an on-the-field scrum that saw Cabrera ejected for breaking out of the grasp of first-base umpire Bill Welke and challenging the Red Sox.
"[Cabrera] was apologetic," Trembley said when asked about his one-on-one with the 26-year-old. "He knows he crossed the line, and we'll move on from it."
But the meeting also included a warning.
"I told him he needs to assume the responsibility that goes with being one of the top pitchers on this team," the manager said. "We've lost [Erik] Bedard, we've lost [Adam] Loewen, we've lost [Steve] Trachsel, we've lost [Chris] Ray, we've lost a bunch of guys here. [Jeremy] Guthrie's a rookie on this club.
"Cabrera's got the most experience. He should assume the responsibility that comes along with that and project and present himself in a way that, when he goes out there and pitches, the guys feel like they're going to win."
Cabrera continued on Saturday afternoon to deny that he intentionally threw at Pedroia.
"Anybody can have a ball slip from his hand," Cabrera said. "I don't know why everybody is making such a big deal."
Trembley didn't appear pleased with Cabrera's response.
"The dog ate my homework, too," Trembley said, sarcastically.
Trembley wants Cabrera to be accountable for what occurred and to take steps to prevent it from happening again.
"There's a key word that's been missing," Trembley said. "It's called responsibility. It's time for responsibility to be accepted by the people that have been given these opportunities."
The incident took place after Cabrera's balk, a mental error hastened by Crisp dancing down the third-base line while the right-hander inexplicably pitched from a full windup instead of the stretch.
"I told him from a baseball side, the whole situation never would have occurred if he had pitched out of the stretch," Trembley said. "I said, 'You can avoid that situation from now on. If there's a fast runner at third, whether there's one out or two outs, always pitch out of the stretch. Then you won't put yourself in a position where you get flustered by a guy that's trying to attract your attention.' So I don't think you'll see him pitching out of the windup anymore when you have a fast runner at third."
Neither Cabrera nor Trembley would say whether they expected the righty to be suspended. Trembley said that he would take the lineup card to home plate before Saturday's game to get any special instructions from umpires, such as a pregame warning against any further hostilities.
"It's in the past already," Cabrera said.
Decision time: Trembley said the Orioles would probably decide on Sunday about what to do with Bedard, who has not pitched since Aug. 26 because of a strained muscle near his right rib cage.
The team has two options: give Bedard more time to heal and hope he can resume baseball activities or shut him down.
"We're running out of time ... to wait it out," Trembley said. "He hasn't pitched since, what, Aug. 26? He hasn't picked up a ball since then. I think you want to do what's right and definitely utilize common sense. "
Meanwhile, a decision on whether to rest second baseman Brian Roberts on Sunday -- which, coupled with an off-day on Monday would provide a two-day break -- will be made after Saturday night's game.
"We're going to go on how he feels. He swung the bat good last night; he felt good. He said he'd come in and talk to me tonight before he left," Trembley said. "We'll mutually make a decision on whether he plays tomorrow, whether he wants a day off or needs a day off or whatever."
Unexpected detour: Right-hander Victor Santos, whose contract was purchased from Cincinnati on Friday, arrived at Camden Yards before Saturday's game surprised to be an Oriole and unsure what the club expected of him.
"I think it's a great opportunity," said Santos, 30, who was 1-5 with a 5.14 ERA in 32 relief appearances with the Reds before being designated for assignment on Aug. 18. "I'm looking forward to going out there and helping the team."
Santos was in Cincinnati, making arrangements to play Winter League ball in the Dominican Republic, when Reds general manager Wayne Krivsky called him with news of the trade. Santos hopped on a plane on Saturday morning and arrived in Baltimore in the afternoon.
Trembley and Santos had not met to discuss the new acquisition's role with the team, but Santos has experience starting and relieving, so he could bolster the Orioles' struggling bullpen or take the place of left-hander Garrett Olson (tightness in left forearm) in the rotation. After being sent to Triple-A Louisville last month, Santos was 1-1 with a 1.11 ERA in eight games, four of them for starts.
"It's about making adjustments, and I've been able to do that for my whole career," Santos said.
Getting closer: Outfielder Corey Patterson's sprained left ankle continues to improve, and he tested it out in batting practice before Saturday's game. But since Patterson remains unable to play, Tike Redman, who hit a homer in his first at-bat, started in center field for a third consecutive game.
"I'm still getting treatment on it," said Patterson, who hurt the ankle chasing Brendan Harris' home run in St. Petersburg on Wednesday. "Like I said, it's going to be a day-to-day thing."
Quotable: "I commend the Red Sox for keeping their cool last night. They had every reason to retaliate, and they didn't. That was smart on their part, because [Jon] Lester was pitching such a great game. Why turn that into something other than what's it's supposed to be -- that's a Major League baseball game." -- Trembley on the Red Sox's reaction to Cabrera's antics on Friday night
Coming up: Guthrie (7-5, 3.65 ERA) closes out the four-game set against the Red Sox, facing right-hander Josh Beckett (17-6, 3.30), who is hoping to grab the American League lead in victories, on Sunday at 1:35 p.m. ET.
Pete Kerzel is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.