DALLAS -- The Mavericks are closing in on the signing of free-agent big man DeJuan Blair, according to sources with knowledge of the talks.

Sources told ESPN.com that the Mavericks -- who remain one of six finalists for the services of Greg Oden -- are in advanced talks to add Blair to a revamped rotation of frontcourt sidekicks for Dirk Nowitzki.

The deal, expected to be a one-year contract at the league mininum $1.4 million, has not yet been officially announced.

But Blair tweeted about the pending deal Tuesday morning.

Dallas!!!!! Now lets have some fun!!!! — DeJuan Blair (@DeJuan45) July 30, 2013

With one source saying Tuesday that a deal looks "promising," the former Spurs center appears poised to join new projected starting center Samuel Dalembert and the re-signed duo of Brandan Wright and Bernard James in a posse of centers to play alongside Nowitzki after Dallas lost out to Houston in the Dwight Howard sweepstakes.

Blair's exit from San Antonio has been anticipated for some time after his increasing struggles to earn playing time from Spurs coach Gregg Popovich last summer.