I am hearing that San Francisco, Oakland and the New York Jets are the three teams ahead of the pack in the sweepstakes for free-agent cornerbacks Nnamdi Asomugha and Antonio Cromartie.

There aren’t many true “shutdown” corners in the game anymore, especially considering so few teams play man-to-man with any regularity. Still, there are some good players expected to be on the free-agent market who can be acquired for the right price.

With Sunday’s Week 16 games in the books, here’s a look at the notable injuries around the league, starting with an update on Chargers RB Mike Tolbert.

The Falcons sent CB Chris Houston to the Lions for a sixth-round pick in the 2010 NFL Draft. The teams also will swap picks in the fifth round.

The Lions and Falcons are discussing a deal to send CB Chris Houston to Detroit for a fourth-round draft pick, according to a league source.

Eagles LT Jason Peters left Sunday’s game against the Falcons with a head injury during the second quarter and has yet to return.