Rob Kardashian has offered his kidney to brother-in-law and close friend Lamar Odom should the seriously ill former NBA star need a transplant.

Khloe Kardashian's brother stepped up with the generous offer after it emerged Odom may need a new kidney as his medical treatment continues in Los Angeles. It's unclear whether Odom and Rob are a compatible match for a kidney transplant, but Rob is willing to undergo medical tests to find out, sources reveal.

One source told Daily Mail Online:

 'Rob is willing to do whatever it takes to help Lamar recover. If that means donating a kidney then so be it, Rob has a big heart and he's willing to step up to help his friend''