ALLEN PARK -- The Lions have two roster openings after they cut cornerbacks Dante Wesley and Paul Pratt.

Wesley was called for a personal foul penalty late in the third quarter on Sunday at the Giants. Pratt was signed from the practice squad on the weekend.

Also cornerback Jack Williams was taken off the physically unable to perform list. The Lions have 21 days to activate him or make another move. Until then he does not count against the roster.

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The Lions continued their revolving door for retread cornerbacks on Tuesday, picking up second-year corner Jack Williams off waivers from the Denver Broncos, and cutting Jason David.

A former fourth-round pick who spent all of his rookie season and the first seven games of 2009 with the Broncos, Williams had 14 tackles — including two special-teams stops — and two passes defensed. Williams was sixth on the Broncos a year ago with five special-teams tackles.

The Lions continue to look for help not only in the defensive backfield, but on special teams, where a kickoff return to midfield in Sunday's loss at Seattle started the flip-flop in momentum after the Lions rattled off a 17-0 start to the game.

David was with the Lions less than a week. The former Colt, who was on the team's 2006 Super Bowl team, was signed last Wednesday, but was inactive for the game in Seattle.