Josh Smith reportedly is the subject of trade talks between the Hawks and Nets. (AP)

The Celtics’ days of Atlantic Division dominance appear to be ending, and the division might soon get even tougher. According to an ESPN report that credits league sources, the Nets — who began Monday with a 1½-game lead over the Celtics for second place in the division behind the Knicks — are making a push to acquire Hawks forward Josh Smith or Bobcats guard Ben Gordon before the NBA’s Feb. 21 trading deadline.

Forward Kris Humphries is the player the Nets are said to be offering as the centerpiece of either deal, with shooting guard MarShon Brooks available as well.

Smith is set to become a free agent following this season and is expected to demand close to maximum salary, so the Hawks risk losing him and getting nothing in return if they stand pat.

The 6-foot-9 Smith is in his ninth NBA season, all with the Hawks, after going directly from high school to the pros. In 46 games this season, he’s averaging 16.9 points, 8.5 rebounds, 4.0 assists and 2.2 blocks — all slightly above his career averages.

Trade offers are in full force as the NBA draft approaches Thursday night, and according to sources close with Jonathan Givony of Draft Express, the Timberwolves offered a deal Thursday to the Bobcats that would have sent Derrick Williams to Charlotte for the No. 2 overall pick in the draft. The Bobcats reportedly immediately rejected the offer.

Williams was the No. 2 pick in last year’s draft. In his rookie season, he didn’t exactly perform to expectations and averaged 8.8 points and 4.7 rebounds per game. He played in all 66 games for the Timberwolves.

The Bobcats, meanwhile, are entertaining a variety of trade offers for their No. 2 pick, according to NBA.com’s David Aldridge, who said they are currently exploring five different options.