The Wall Street Journal-affiliated blog, citing several sources inside and outside the Internet company, said the revamp would likely come on Wednesday, although it could be pushed out a week or two or rolled out in pieces.

Bartz sent a memo to employees on Friday in which she said, "Get well-rested, because next week's a biggie."

Yahoo officials declined to comment. A source at Yahoo, who was not authorized to speak publicly about the issue, said rumors of a reorganization were swirling within the company.

Yahoo, the leading provider of online display advertising, has been under pressure for nearly a year as it held fruitless merger or partnership talks with Microsoft Corp, Google Inc and Time Warner Inc's AOL.

During that time, Yahoo lost market share in search advertising, while display ad sales have been badly hit industrywide by the US recession.

The reorganization is expected to include a structure where executives like chief operating officer, chief technology officer and a new, more powerful chief marketing officer all report to Bartz, the blog said.