KEY POINTS
  • Disney is selling the networks to complete its deal to acquire movie production and television assets from Twenty-First Century Fox.
  • Liberty Media joins Major League Baseball in the bidding, but Sinclair Broadcast, which had been looking to bid, is now said to be out of the process.
The headquarters building of Liberty Media Corp. stands in Englewood, Colorado, U.S.

Liberty Media has joined the bidding for the regional sports networks that Disney is trying to sell to finalize a deal with Twenty-First Century Fox, sources told CNBC.

Liberty and Major League Baseball have submitted bids in the auction. Disney is selling them in order to complete its $71 billion deal to acquire Fox's movie production and television assets, which included the regional sports networks. That deal is expected to close within weeks.