After spending the weekend upgrading their offense, the New England Patriots have turned their attention to fixing one of the league's worst defenses in 2011.
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Former San Diego Chargers defensive lineman Luis Castillo traveled to New England this past weekend for a Saturday visit with the Patriots, a source told the Boston Herald on Monday. Castillo left New England without agreeing to a deal, according to the Herald.
Castillo missed all but one game in 2011 because of a broken leg, but has been a consistent presence on the Chargers' defensive line throughout his seven-year career.
Free-agent wide receiver Brandon Lloyd agreed to terms with the Patriots, a league source told NFL Network's Michael Lombardi on Saturday.
