The expected announcement by ABC this week that "This Week" anchor George Stephanopoulos will succeed Diane Sawyer as the co-anchor of "Good Morning America" is bringing other changes.

According to a source familiar with the situation, correspondent Juju Chang has been offered the position of news anchor on the morning show. She would replace Chris Cuomo, who was in the running to replace Sawyer but is not expected to remain on the show.

ABC executives are in "very active discussions" with him about co-anchoring "20/20," the source said.