Lamar Odom's Kidneys Aren't Functioning Correctly, He May Have Damaged Lungs, Source Says: 'He'll Never Be the Same'

Although Lamar Odom has made a miraculous recovery, he’s still facing a serious health crisis, a source close to the Kardashian family tells PEOPLE.

Two weeks after he was found unconscious in a Nevada brothel with drugs in his system, the former NBA player is being treated at Cedars-Sinai Medical Center in Los Angeles, where he underwent emergency surgery said to be connected to pneumonia Wednesday.

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“It’s two steps forward, then a step back, but it does feel like some progress is being made, little by little. There’s still a black cloud, like, ‘Okay, what’s next?’ ” the source says. “The pneumonia was a huge setback, and now there’s worry about permanent scarring of the lungs. His kidneys are still not functioning correctly, but he’s nowhere near strong enough to even think of a transplant, so he’s on dialysis.”

Odom, 35, was in a coma for four days at a Las Vegas hospital before being transferred to L.A., and the trauma has affected him physically and mentally.

The source says Odom has suffered multiple strokes and is now “responsive, but very slow,” the source says.

“He can carry out simple directions, but it takes some time for him to do it,” the source adds. “But that’s way better than he was last week, so the family is taking the good news as they get it. He has wrecked his body, so it’ll take time to figure out how well he can come back. But everyone knows that he’ll never be the same as he was before this happened. There will always be lasting effects, and doctors are just trying to minimize them.”

Odom’s wife Khloé Kardashian has stuck by his beside, leaving only to attend sister Kim Kardashian West‘s baby shower Sunday.

The estranged stars recently called off their nearly finalized divorce, and all of the Kardashians have rallied around Odom in his time of need.