VIDEO : Kardashians Worried About Khloe Dating Another NBA Player

Kim and Kourtney Kardashian had ?concerns? about Khloe dating another NBA player after marrying Lamar Odom.

And a family source says that "their fears appear to have serious merit.?

Tristan Thompson was reportedly caught getting close to another woman at a New York City nightclub.

TMZ said the NBA star also made out with two women at a hookah bar in October.

Khloé is nine months pregnant with Thompson's child together.