EXCLUSIVE

Lamar Odom and Khloe Kardashian have decided to pull the plug on their spin-off show "Khloe & Lamar."

Sources tell TMZ, the show's second season will be its last ... because Lamar wants to focus on reviving his fizzling NBA career. We're told E! is still trying to convince the couple to reconsider, but K&L are standing firm ... they just don't want to do it anymore.

As we previously reported, Lamar was relegated to the Dallas Mavericks' inactive list after putting up career low numbers this season. If he's lucky, he'll be traded. If not, who knows ...

But we're told Lamar is determined to make a comeback -- and he feels he should focus on only one project. Lamar will be living in L.A. full-time and he's hired trainers to help him get his game back.