The Bullets will hold a news conference today to announce the signing of forward Tom McMillen.

The Bullets acquired McMillen and a second-round draft choice from the Atlanta Hawks in a deal last Tuesday. The Bullets traded Randy Wittman of Indiana, whom they had just drafted with the 22nd pick in the first round, to the Hawks for McMillen.

McMillen was in England when the deal was made and it was held up because of a technicality involving McMillen's contract with the Hawks. Atlanta held an option on his contract and it was uncertain whether Atlanta could trade him under those circumstances.

The National Basketball Association's league office ruled the trade could go through and the deal was made final yesterday. McMillen signed a multiyear contract for an unspecified amount, believed to be for more than $200,000 a season.

McMillen said at the time of the trade that he was pleased with the deal and hoped it would be approved. McMillen, 30, is a 6-foot-11 forward whom Bullets Coach Gene Shue has sought for two seasons. He averaged 8.3 points a game last season. McMillen is a graduate of the University of Maryland; he still lives in the state and has said he is considering running for office one day.

Shue said McMillen is important to the Bullets because they need an experienced front-court player to complement Rick Mahorn and Jeff Ruland.

In another matter, the Seattle SuperSonics are still interested in Bullet forward Greg Ballard, but so far no firm offers have been made.

In Utah, Jazz General Manager and Coach Frank Layden said Adrian Dantley is not for sale or up for trade. The Bullets are one of several teams that have made a pitch for the high-scoring forward from Washington, D.C., who missed most of this past season after wrist surgery.