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Posted by ESPN.com's Bill Williamson
While nothing is concrete, a source close to the situation said that the Raiders are toying with the idea of pursuing free-agent tackles Khalif Barnes of Jacksonville and Marvel Smith of Pittsburgh.
The Raiders are looking for both a right and left tackle and would ideally like to add one in free agency and the other through the draft. The team hasn't made a move on Barnes or Smith yet, but it could strike. Smith can play both right and left tackle and he is from Oakland. Barnes is also an experienced player who could help Oakland if it decides to pursue him.
Meanwhile, Oakland guard Cooper Carlisle is going to visit an undisclosed team Saturday with more trips being lined up during the weekend. Oakland is trying to re-sign Carlisle, who many believe is the Raiders' best offensive lineman.