Raiders sign QB Boller after Gradkowski injury

The Oakland Raiders signed free-agent quarterback Kyle Boller to undisclosed terms Thursday, one day after Bruce Gradkowski tore a pectoral muscle while lifting weights.

Gradkowski will undergo surgery for the injury Friday, but he's expected to be fully healed by the start of training camp in July, his agent, Ralph Cindrich, confirmed in an e-mail.

The addition of Boller gives the Raiders three healthy quarterbacks on their roster entering the upcoming minicamp and OTAs, with former No. 1 overall pick Jamarcus Russell and Charlie Frye.

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