Now that the Buc's have released Donald to pursue other options, it is not much of a surprise that the Raiders immediately showed interest in the lineman. Not only does Offensive Coordinator Greg Olson have a history with Penn for when he was the OC in Tampa Bay, but the Raiders have a noticeable need at the LT position after the snafu with Roger Saffold.
With the match being pretty obvious, it should also be no surprise that Donald Penn is in town for a visit with the Silver and Black, this according to various sources. The Raiders need to fix their now vacant left side of the line as quick as possible and Donald Penn would prefer to have a job. It also doesn't hurt that the most likely team to pay the most for Penn's services happens to be the Raiders as well.
Donald had won the starting job in Tampa Bay all the way back in 2007 and he hasn't missed a start since getting the job. He played in 12 games in '07 and has now started all 16 games in each season from '08-'13. That is as durable as you can get and certainly had to be a draw in the Raiders interest in the FA after voiding the deal with Saffold over injury concerns. Hopefully Oakland won't let him leave without a contract in hand.