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Despite a report last night that Lamar Odom had checked into rehab, TMZ is now saying that the troubled NBA star has NOT entered a treatment facility ... instead, the site claims he's gone "off the radar"!

Apparently Odom hasn't been in touch with the Kardashian family for the last few days, and though People magazine had two separate sources confirming that the athlete was in rehab, the location was never reported.

Odom's rep never confirmed the news, but after the NBA star was arrested last Friday for D.U.I., it seemed totally plausible. Just days before Odom's arrest, his teammates and agent attempted to have an intervention, but he reportedly left and didn't want their help. However, the very next day Lamar spent the night with estranged wife Khloe Kardashian at the couple's Tarzana mansion, and Khloe has been seen with her wedding ring back on. While things appeared to be looking up, last month X17 photographers snapped momager Kris Jenner meeting with family lawyer and high-profile divorce attorney Laura Wasser, who handled Kim's split from Kris Humphries.

So what's going to happen next? And where in the world is the basketball star!? Stay tuned...