When Mayor Bloomberg was running for re-election, he vowed to exert more control over the World Trade Center site redevelopment, promising to rethink the site plan and possibly oust the developer who leases the site from the planning and building process.

Within a week, he plans to make his first move in what could turn into a major thrust of his second term.

The mayor said yesterday that he would pick four people to fill vacant spots on the board of the Lower Manhattan Development Corporation, the agency established to oversee the rebuilding process, before next week’s Empire State Development Corporation meeting. The ESDC is the LMDC’s parent agency and must sign off on appointees to the board.

“I will make sure they are candidates who will represent this city and have a variety of expertises they can bring to it,” Mr. Bloomberg said at a news conference in Lower Manhattan. “In terms of influence, the city is a part of this process, and I think rightly so. It takes place in the middle of our city.”

The deputy mayor for economic development and rebuilding, Daniel Doctoroff, is putting together a list of names for the mayor, from which Mr. Bloomberg will choose his appointees. Neither the mayor nor his aides would say yesterday who is under consideration.

Before Election Day, the mayor staked out a tough position on the rebuilding, leading the developer who owns a 99-year lease on the site, Larry Silverstein, to call the mayor’s actions “confusing.” The governor, who appoints half of the board members of the Lower Manhattan Development Corporation and has three appointments to make himself, said at the time that he was “perplexed” by the mayor’s comments.

Yesterday, the mayor had kind words for the governor, who he called “cooperative.”

“The governor has been cooperative, and I’ve worked well with him,” he said. “We don’t always agree on everything, but I think Pataki’s done a good job and will continue.”

He added: “We want to make sure that what we’re doing is what the marketplace wants and what the city needs, and those things constantly change and that’s what we’re trying to address.”

A spokeswoman for the governor, Joanna Rose, said, “We will be coordinating with the mayor’s office to fill the remaining vacant seats on the board in the very near future.”

The most recent member to depart the LMDC board was Roland Betts, who stepped down last month. He had served on the board since its inception. A spokesman for the development corporation, John Gallagher, said the seat left unfilled the longest was the one vacated by Howard Wilson, a Giuliani appointee, in November 2002.