ABC, Robin Roberts plan 'big announcement' on 'Good Morning America' Monday

Robin Roberts could be returning to ABC's "Good Morning America" very soon.

The network and Roberts are planning what ABC called a "big announcement" Monday in communication to affiliates.

Roberts began a medical leave from the show in August. She has been treated for MDS, a blood and bone marrow disorder. Roberts received a bone marrow transplant from her sister shortly after going on medical leave.

"Looking forward to sharing news of my recovery with you on Monday, Roberts tweeted Friday.

It is widely expected that Roberts and the network will announce her return to GMA.