Kathrada wishes Tutu a speedy recovery
The arch was admitted to a medical facility in Cape Town on Tuesday due to a persistent infection.
The Nobel laureate was admitted to a medical facility in Cape Town on Tuesday.
Mpho Tutu says her father is on a course of antibiotics to treat a persistent infection.
Kathrada sent his well wishes to Tutu.
"Once I heard of his illness I was actually very disturbed about it - he's not young anymore. We do know that he'll get the best treatment that is necessary. We wish and pray that he will recover as soon as possible."
In a statement released late on Tuesday, Mpho said the family hoped he would be discharged this week.
The archbishop in December cancelled plans to travel to a meeting of Nobel laureates in Rome because he had started a new course of medication to manage his prostate cancer.
Tutu was diagnosed with prostate cancer and underwent treatment in the United States in 1997.
In 2011, he was hospitalised for 'minor' elective surgery.
Tutu was hospitalised again in 2013 for a persistent infection.
He was in high spirits during his most recent public appearance earlier in July.