The Kansas City Chiefs have lost starting safety Eric Berry for the season with a torn ACL, according to a source with knowledge of the situation.

It is another huge blow to a Chiefs team that has already suffered injuries to other key young players such as Tony Moeaki, who is also out for the year with the same injury.

Berry was hurt at the start of its season opener against the Bills on a block the Chiefs felt was illegal and worthy of league discipline.

The fifth overall pick in the 2010 NFL Draft, Berry started all 16 games for the Chiefs as rookie, earning a Pro Bowl nod last season.

The Chiefs have a lot of work to do, in all phases of the game, if they are to overcome the losses of key players for the year. So far, as yesterdays game showed, they aren't up to the task.