Former NBA player Lamar Odom, estranged husband of reality-TV star Khloé Kardashian, reportedly may need kidney-transplant surgery after his recent collapse and four-day coma.

People magazine said Tuesday that Odom, 35, had experienced significant damage in both kidneys after falling unconscious last week at a Nevada legal brothel, where he had used cocaine and sexual-performance enhancers, according to the Nye County Sheriff's Office. While no transplant is actively planned for the foreseeable future, the magazine said, it is an option being considered.

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Odom is in Los Angeles' Cedars-Sinai Medical Center after being transferred Monday night from Sunrise Hospital in Las Vegas.

Kardashian, 31, made her first public comments on Odom, tweeting to fans Tuesday, "Your support is overwhelming." The tweet linked to a post reading, "The past week has been incredibly difficult. I am so thankful to family, friends and fans, who have sent nothing but prayers and well wishes to Lamar. I also want to take a moment to thank everyone at Sunrise Hospital, including the amazing doctors and nurses for their kindness and diligent work. Under their amazing care, incredible strides have been made. You can never be prepared for an experience like this, but without the outpouring of love and endless prayers that Lamar has received and the strength I was given from my loved ones, it would have been difficult to endure. Thank you for your continued support. God is great!!!"

TMZ.com said Tuesday that while Odom's other failing organs had recovered to a large degree, his kidneys must undergo dialysis for six hours a day. Doctors plan on performing brain tests, the website said, to help gauge the extent of damage caused by several strokes Odom reportedly suffered after being hospitalized last week.