The NBA trade season is officially underway now that the pool of available players has increased as it does every Dec. 15.

Players that signed free agent deals in the offseason cannot be traded until Dec. 15.

"It's about to heat up on Dec. 15," one Eastern Conference general manager said. "Conversations are definitely happening because once Dec. 15 comes, the pool increases. You've heard a lot of rumors about Pau Gasol, Andrea Bargnani. The names are only going to grow on Dec. 15."