Both general manager Ed Wade and manager Brad Mills said the team planned to take it slow with the reliever, who missed all of last year. Arias is scheduled to throw on Tuesday, but it's unlikely he will throw for at least a few days.
"We're going to have to give him a couple of more days off and see how he comes back and how he works with that," Mills said. "He wasn't able to throw the ball like he really wanted to [Sunday], but we'll see how he is after a couple of days off. We're going to bring him along slower to build up that range of motion and everything else."
Arias went 2-1 with a 3.35 ERA in 42 games in 2009 after being claimed off waivers from Colorado a year earlier, but he was injured last spring and underwent surgery April 22. Arias agreed to terms on a one-year contract on Monday worth $439,000.