The Milwaukee Bucks scheduled a news conference today, and the Dallas Mavericks had some wheels in motion, building expectation that two NBA head coaching vacancies could be filled within the next day or two.

Bucks owner Herb Kohl, looking to replace recently departed Don Nelson, has met several times this week with Del Harris, the No. 1 assistant under Nelson. Kohl has said he might decide to offer Harris, former coach of the Houston Rockets, the job without interviewing anyone else.

Mavericks General Manager Norm Sonju made his case to owner Don Carter on why John MacLeod, who was fired by the Phoenix Suns in February, should be the Mavericks' next coach. A bit later Carter was winging toward Phoenix to talk to MacLeod.

"Mr. Carter and Rick Sund {player personnel director} are flying out tonight to meet him {MacLeod}, and then flying back," said the Mavericks.

"It's just a unique situation that MacLeod is available," Sonju said. "He impressed us with his positive attitude in Monday's interview. We feel very strongly about John."

Carter was out of town when MacLeod, who coached the Suns for 14 seasons, was interviewed by Sonju and Sund in the Mavericks' search for Dick Motta's successor.

Carter held a closed-door meeting with Sonju yesterday after Richie Adubato, an assistant under Motta, submitted a resume'.

"Richie's application is just academic," a team source told the Associated Press, " . . . if Don gives MacLeod a green light and a contract can be worked out."

MacLeod canceled a scheduled interview with the New York Knicks, who are also looking for a head coach.

"I'm committed to the Mavericks," MacLeod said. "I'm basing my decision on the integrity of the Mavericks and Don Carter . . . "

The Philadelphia 76ers have hired Fred Carter off the Washington Bullets staff as an assistant coach and signed current assistant Jim Lynam, a onetime American University coach, to a two-year contract.