According to a report from Pro Football Talk, the Titans are putting Johnson on the trading block since they do not want to pay him the $8 million he's due in 2014.
If there are no suitors for Johnson, then the Titans are prepared to release him.
That last bit of information is interesting, since teams would rather sign Johnson to a deal in free agency than agree to a trade and take his current contract.
If that's Tennessee's intent, the possibility of trading Johnson may be difficult if teams are aware they'll ultimately release him otherwise.
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Aaron Wilson covers the Ravens for The Baltimore Sun.