Joe Bugel, Boss Hog as Redskins' offensive line coach, has been approached by the U.S. Football League's Pittsburgh franchise about becoming its first head coach.

Bugel was not immediately available at Washington's Carlisle, Pa., camp to comment, but other sources confirmed a report in the Pittsburgh Press that Bugel had met over the weekend with Paul Martha, general manager of the expansion club owned by Edward DeBartolo Sr., father of the San Francisco 49ers' president. Bugel is a native of the Pittsburgh area.

The unnamed USFL team had another move afoot to field a strong offensive line--overtures to an NFL first-round draftee, tackle Jimbo Covert of Pitt--until Covert finally signed yesterday with the Chicago Bears . . .

All-pro cornerback Everson Walls, only two years out of college and pressing for big money, sent NFL Commissioner Pete Rozelle notice of intention to retire. One thing the notice does is avert a $1,000-a-day fine for missing Dallas Cowboys camp after tonight's reporting deadline. "He's a little young to be retiring, don't you think?" says Cowboys President Tex Schramm. "Our last offer stands" . . . John Hannah, all-pro who retired recently from the New England Patriots, says, gee, he'd gladly unretire if he could join his brother, Charley Hannah, on offensive line in California now that Charley has been traded to the L.A. Raiders by Tampa Bay because the Bucs couldn't stomach his contract demands. The Patriots would have to be compensated before letting John go . . . Doug Williams, the Buccaneers' quarterback, insists he'll hang it up if they don't make him a $3 million man (five-year deal) . . .

The Detroit Lions report that Billy Sims has rejected their best offer and intends to play out his option this season. Sims' agent is Jerry Argovitz, honcho of USFL's Houston Gamblers, so Coach Jack Pardee might find himself with a premier running back in '84 . . . USFL's new San Antonio franchise has chosen as coach Gil Steinke, 63, who made a big rep at a small college in 23 years coaching Texas A&I . . .

Cincinnati Bengals brass say they intend to "return the favor" and start raiding USFL clubs. Because the Boston Breakers have Bengal Dan Ross tied up as a future and the Tampa Bay Bandits have Cris Collinsworth similarly contracted, the Bengals are trying to sign five players from those two squads to "future" contracts: Bandits' Jimmy Jordan, Eric Truvillion and Keith Clark; Breakers' Nolan Franz and Marcus Marek.