Stuff New Zealand
Lomu, who suffers from the serious kidney disorder nephrotic syndrome, was recently re-admitted to hospital with an infection.
His wife and manager Nadene told TVNZ Lomu was "fighting a great battle" and remains on dialysis.
Hospital spokesman Mark Fenwick said this morning that Lomu's condition was stable.
The former All Black superstar's latest ordeal began during last year's Rugby World Cup when he was admitted to Auckland City Hospital.
Lomu, who had his first organ transplant in 2004, told a women's magazine this month that he needed a new kidney and had lost 30kg since last September.
"We were hoping to see some improvement but nothing has made any difference, so the next step is to try to find a donor," Lomu said of his current plight.