"I told him I can play," Roberts said. "I tried to talk him out of not playing, but that's his decision."
The switch-hitting Roberts fouled a pitch from Toronto starter Brett Cecil off his front leg while batting right-handed in the first inning of Saturday's game. Roberts played through the soreness for a while, but he was replaced by pinch-hitter Robert Andino in the third inning. Roberts walked with a slight limp after the game.
"I'm glad everybody always wants to play, but I think it's best that [with] the way he was moving around yesterday, that he doesn't play today," Trembley said on Sunday. "He's pretty sore."
X-rays on Roberts' leg came back negative, and he is considered day-to-day. Roberts seems pleased with the way his leg has healed so far.
"It's feeling better than I thought it was going to feel this morning," Roberts said. "I slept better than I thought I would, so that's good. We did some good stuff yesterday to try and get some of the swelling down. Just another day will hopefully make it even better.
"When you're weight bearing, you get some soreness. But I also haven't really run or done anything, so I don't know what it would feel like doing that."
Trembley put Andino at second base in the final game of the team's weekend series against the Jays, and he penciled left fielder Felix Pie into Roberts' usual leadoff spot in the lineup.
While Roberts would rather have been playing, he planned to make the most of his day off.
"It's one of those days where, as an everyday player, you try to let your mind relax a little bit, just because you need those days every now and then," Roberts said. "I will certainly be there rooting my teammates on, but I will also probably have to get some treatment during the game, just to keep that going. If I'm going to have a day off, I might as well use it for benefit, too."
Trembley did not completely rule out the possibility of using Roberts at some point in Sunday's game, but the manager said he wanted to give the second baseman the whole day off if he could. The Orioles will face A's left-hander Gio Gonzales on Monday, and Trembley wanted to make sure Roberts -- who has better numbers against lefties -- would be able to play.
Trembley added that Roberts would have to wear a guard on his left leg to be able to play in Monday's game.
Erika Gilbert is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.