Defensive tackle Jumpy Geathers, who has spent eight often frustrating weeks on the "physically unable to perform" list, apparently will make his debut for the Washington Redskins on Sunday against the Detroit Lions in the Pontiac Silverdome.

Geathers, who goes 6 feet 8, 290 pounds, will be used as a pass-rushing specialist, probably replacing Darryl Grant.

It is unclear who will be moved off the roster to make room for him. The Redskins weren't saying last night, although they made it clear Geathers, 30, almost certainly will be activated this week.

One possibility appears to be tackle Tracy Rocker, who has a sore knee. Rocker was removed from the 21-10 loss to the New York Giants last Sunday after jumping offside early in the game, and coaches have said newcomer Eric Williams will start in his place this week.

Geathers was a Plan B free agent and had several offers although he was recovering from reconstructive surgery on his right knee. He underwent similar surgery on his left knee two years earlier.

Still, several teams offered him big money and he narrowed his choices to the Redskins and 49ers before signing a three-year, $1.5 million deal with Washington. Sanders Update

Wide receiver Ricky Sanders didn't receive a new trial date yesterday and his attorney remains hopeful the case can be delayed until after the season. Judge Donald Shipley asked both sides to come up with an agreeable date this week, but several meetings failed to settle on one.

All the sides, including Shipley, will meet again next week.

"I don't think we're going to try this case before the season is over," attorney Wendell Odom said.

Sanders faces charges stemming from a May 1 argument in the parking lot of a Houston bar. Coleman Held Out

Linebacker Monte Coleman (knee) didn't practice yesterday, but is listed as probable for Sunday's game. . . . Since scoring 38 points at Phoenix, the Redskins' offense has scored a total of 43 the last three games. However, only four teams have allowed fewer than the 103 points surrendered by the Redskins. The NFL average is 150.4. The teams that have allowed fewer points all lead their divisions -- Miami (90), the Giants and Bears (96) and the Raiders (99). . . .Detroit's last victory against the Redskins came in 1965. The Redskins under Joe Gibbs are 8-1 in domed stadiums; 19-4 overall against the NFC Central Division. . . . The '90 Redskins have outscored opponents 97-49 in the second half. . . . The three sacks the Giants got against the Redskins were the first Washington had given up since allowing Dallas three in Week 3. The Redskins have a plus-13 sack differential -- the second best in the NFL. . . . The Redskins have not allowed a 100-yard rushing game since Week 11 of last season when Denver's Bobby Humphrey gained 110. . . . Detroit's Barry Sandersgained only 10 yards on 12 carries last Sunday against New Orleans.