The Ravens have lost cornerback Chris McAllister for the season due to a knee problem.  He played in 6 games for the Ravens this season and he made 16 tackles, had 3 interceptions and he defensed 7 passes.  Frank Walker will replace McAllister in the starting lineup and he has played pretty well.  Walker has played in 8 games this season and he has made 21 tackles, had 1 interception and he has defensed 7 passes.  Look for Walker to do a decent job filling in for McAllister.