Robin Roberts to return to Good Morning America chair on Feb 20

Five months after she underwent a bone marrow transplant, Robin Roberts will return to her role as co-host of ABC's Good Morning America. 

The "Good Morning America" team made the official announcement of her return Thursday, saying Roberts's medical team had cleared her and she has quietly been doing "dry runs" in the studio, the New York Daily News reported.

"What a difference a year makes," said Roberts, who began feeling the symptoms of her illness about a year ago.

"I cannot wait to return to my 'GMA' family. It's going to be an incredible morning in Times Square. The overwhelming thoughts and prayers of the viewers have played a major part in getting me here today.

"I cannot thank everyone enough."

More from GlobalPost: Good Morning America co-host announces she has MDS

Entertainment Weekly reported Roberts left GMA in September after being diagnosed with myelodysplastic syndrome (or MDS), a rare blood disorder. She underwent a bone marrow transplant on September 20, and has spent the ensuing months recovering.

In an interview on "GMA" Thursday, Roberts said she attended Super Bowl festivities last weekend and in general her doctors have encouraged her to gradually enter more social and professional situations."

Roberts has been preparing for her return to the morning program with a series of “dry runs” last month.

ABC will recount Roberts' cancer battle in a special edition of "20/20" on Friday, Feb. 22, at 10 p.m.