“Good Morning America” co-host Robin Roberts confirmed Monday morning that it’s her last week on “GMA” before she begins medical leave for a bone marrow transplant.

Roberts revealed earlier this summer that she had been diagnosed with myelodysplastic syndrome (MDS), a rare blood disorder that affects bone marrow; the condition was likely caused by treatment for breast cancer five years ago, she said.

Seated on a couch with co-host George Stephanopoulos and other members of the show, Roberts said Friday will be her final day, and she will check into the hospital next Tuesday to begin the process before her transplant (her older sister, Sally, will be her bone marrow donor).

This week, “GMA” will feature stories about other people fighting MDS, including a family with three children who have all been diagnosed with the disorder.

Roberts also thanked ABC News and parent company Disney for being “phenomenal” in their support. “I know that I’m going to have a job when I come back. Just the comfort — and I know that is not the norm,” she said.

“GMA” recently beat “Today” show in the ratings in the week after the highly-rated summer Olympics by about 162,000 viewers, Nielsen reported.