Coach on the spot: San Diego

Posted by ESPN.com's Bill Williamson

San Diego coach on the spot: Defensive backs coach Steve Wilks.

Wilks, who worked with San Diego defensive coordinator Ron Rivera in Chicago, is a new coach in San Diego.The reason why he was brought to San Diego was simple: to shore up a talented unit.

It is all about defense for the Chargers in 2009. San Diego general manager A.J. Smith said last week during the team's minicamp that defense will be the key to the Chargers' success, especially the pass defense.

San Diego's defense rebounded late last season after Rivera took over as defensive coordinator. Still, the pass defense struggled at times.

Wilks' job should be made easier with pass-rush superstar Shawne Merriman returning from injury and because of the presence of top pick, pass-rush linebacker Larry English. Still, cornerback Antonio Cromartie needs to rebound from a poor 2008 and the team needs better safety play opposite Eric Weddle. Wilks has some vital coaching ahead of him.