Everyone knows what to expect for most of the NFL preseason: Stars and starters will play only sparingly in games, if at all.

Still, Cowboys fans looking forward to Saturday night’s preseason opener against the Rams will be disappointed to learn that Dak Prescott, Ezekiel Elliott and several other stars are not expected to play at all. Not even that token first series or two many starters around the league get.

Last month, the Ravens waived quarterback David Olson after he spent a week with the team and signed fellow quarterback Josh Woodrum.

The shuffle under center remains ongoing as veteran Joe Flacco recovers from a back injury suffered while lifting weights earlier this offseason. With Flacco hampered by a disc problem in his back, backup Ryan Mallett has been leading Baltimore’s first-team offense throughout camp.

Meanwhile, starting guard Alex Lewis will miss the entire season with a shoulder injury that requires surgery, and rookie wide receiver Tim White also will miss the season after injuring his thumb in Thursday’s preseason opener against the Redskins.

The Ravens expect Flacco to start under center in their regular-season opener Sept. 10 against the Bengals, but he won’t play before then.

He wasn’t the only notable Jaguars player back at practice Saturday, NFL.com reported. Defensive end Calais Campbell returned after not practicing since July 30 because of an undisclosed medical issue.

The legend of Leaf being the biggest draft bust in NFL history keeps growing. The No. 2 overall pick in 1998 was a dismal 4-14 in his only two years starting in San Diego. Pick an awful number, any awful number for the evidence: a 48.4 passer rating, a 13-33 TD-INT ratio, a 50.0 rating, 65 sacks taken and at least one ugly locker-room incident. Dishonorable mention goes to Craig Whelihan.dolphins_041