GLENDALE, Ariz. -- Dodgers outfielder Alfredo Silverio, who is in camp but has not participated in any Spring Training drills, will be sidelined indefinitely with aftereffects from a January auto accident in his native Dominican Republic.

The most serious of his injuries is a concussion, which still has him woozy. He also suffered bruises to his neck, elbow and shoulder.

"I feel terrible for the kid, honestly," Dodgers manager Don Mattingly said. "You see his face, he looks dejected. He gets on the 40-man roster with a chance to come to camp and show something -- he had a very good year last year, he's a talented kid. For this to happen, that's really sad for him."

Silverio, 24, is coming off a breakthrough Double-A season in his eighth professional year, which included four seasons in the Dominican Rookie League. The slow bloomer hit .306 with 16 homers, 85 RBIs and 90 runs and was added to the 40-man roster last November to protect him from the Rule 5 Draft.

Silverio was ranked No. 15 by MLB.com on the Dodgers' Top 20 Prospects list.

Now he's on a very slow track as he recovers from the injuries.

"There isn't even a timeline right now," Mattingly said. "He's still having the concussion symptoms. Nowadays, nobody messes with that. It's definitely good to get him with our [medical] people, get him in our hands and start the [rehab] process. This way, we can keep an eye on him and monitor what he's doing.

"At least here he's a part of it. If he were home, it would be out of sight, out of mind. The fact that he's here, it's good for him, it's good for us. Hopefully, this is just that step backward before he steps forward again."