Jones fouled a ball off the foot Saturday and underwent an X-ray on Sunday that was inconclusive, requiring further testing.
Jones is expected to undergo a CT scan on Monday to determine the full extent of the injury.
"I don't know what's wrong," Jones said. "We'll see tomorrow. It's not comfortable. I'd be able to play if it was comfortable."
Baltimore manager Dave Trembley had said before the game that he was giving Jones a scheduled day off and that he'd be available as a defensive replacement if the Orioles needed him. But after the X-ray came back, Trembley figured it was more responsible to rest Jones and make sure he's OK before he sends him back into the lineup.
"You've got to wait until you see what happens tomorrow when he gets checked when we go to Anaheim," Trembley said. "I'm concerned, but I'm not smart enough to know whether it's a long-term injury or not."
Jones, who has played in 108 of Baltimore's 110 games, said Sunday that he's never experienced this type of injury. The 23-year-old, who is batting .279 with seven home runs, also said that he looks forward to getting some resolution.
"I woke up this morning and it was hurting," Jones said. "I had it taped yesterday after it happened, but I woke up and I couldn't walk. If need be, I can [play]. But it was something where I didn't feel comfortable. I was basically icing it all day. ... My right ankle felt like this the other day, so hopefully I can bounce back as quick as I did the other time."
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.