The journalist had a five-minute procedure on Thursday (September 20), where millions of bone marrow cells donated by her sister Sally-Ann were injected into her blood stream as part of her treatment for bone marrow disorder myelodysplastic syndrome (MDS).
Diane Sawyer and GMA weatherman Sam Champion were present for the procedure, with Champion later recalling the emotion he felt to ABC News.
"It was an emotional, scary and yet exhilarating moment, one that I'll never forget," Champion declared.
Roberts has also issued a statement detailing the next steps of her recovery over the next several days.
She said: "I will now wait and anxiously watch and see what happens. In the next seven to 10 days my counts will continue to go up and we'll be on to phase three, which will be get out of here. Get out of here. Go home. It's a journey."
Recovery time from the bone marrow transplant is estimated at anywhere between 30 to 100 days.
Roberts has vowed to return to Good Morning America once her treatment is complete.
The anchor joined ABC's morning show as a special correspondent in 1995.
Watch Robin Roberts discuss her battle with MDS on Good Morning America below: