Endeavor and WWE did not immediately respond to requests for comment on Sunday. The deal could be announced as early as this week, the sources said. Endeavor shareholders will own 51% of the combined company, while WWE shareholders would get 49%, the sources said. Endeavor is led by Hollywood power broker Ari Emanuel, who earlier this month declined to answer questions about a possible deal. In January, WWE said it would explore strategic options that could include a sale, shortly after Vince McMahon's return to the company.

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