The Tennessee Titans’ jerseys may be light blue, but not because the sky has fallen — yet. At 0-4, I expected there to be some sense of despair after practice today, in this knee-jerk, reactionary NFL in which we reside.

The Titans’ 29th-ranked pass defense likely won’t get any relief against the Jaguars this weekend. Backup S Vincent Fuller (forearm) has been ruled out for Sunday’s AFC South showdown, and starting CB Cortland Finnegan (hamstring) is listed as doubtful. Backup DT Jason Jones is listed as questionable.

A look at the official Thursday injury reports reveals a number of ailing players — including Marion Barber, Darrelle Revis, Justin Tuck and Cedric Benson — taking part in full practices today.

Chad Pennington, Shawne Merriman and Frank Gore were among the key players who sustained injuries in Week 3.

One of the biggest surprises in the NFL last season was the Titans’ improbable run to a league-best 13-3 regular-season record and the dethroning of the almighty Colts, snapping Indianapolis’ five-year reign as AFC South champions. Even more stunning was the rebirth of 36-year-old Kerry Collins, who led the Titans to a 10-0 start and a No.1 seed in the AFC playoff race. Now, everyone wants to know if the Titans can do it again with Collins at quarterback.

QB Carson Palmer told reporters that this current Bengals team is as good as any he’s had during his seven years in Cincinnati. This time of year is full of hyperbole, but fantasy owners should take notice of the Bengals.

The Tennessean is reporting that the Titans will elevate secondary coach Chuck Cecil to defensive coordinator.

Tennessee took one hit Sunday against Houston and Titans cornerback Cortland Finnegan took another Thursday for two hits he delivered versus the Texans. Finnegan was fined $25,000 for roughing the passer when he made helmet-to-helmet contact with quarterback Matt Schaub, and on another play for unnecessary roughness when he speared the opponent on a pass play.

Titans cornerback Cortland Finnegan was limited in practice on Friday with a hamstring injury and was listed as questionable as Tennessee plays host to the Browns. Cleveland will be starting Ken Dorsey at quarterback.