Top cable provider Comcast is also considering whether it could buy some selective Time Warner Cable markets, or team up with another cable company besides Charter Communications Inc to bid for all of Time Warner Cable, the people said.

Besides Comcast and Charter, privately held Cox Communications Inc also has interest in a potential deal involving Time Warner Cable, people familiar with the matter have previously said.

Comcast, which has a market capitalization of roughly $127 billion, could ultimately decide not to do any deal, said the people, who asked not to be named because they were not authorized to speak with media organizations.

A full takeover of Time Warner Cable makes sense because the company has geographic markets complementary to Comcast, while taking on a partner would give them opportunity to pick and choose key markets, one of the people said. Analysts say buying all of Time Warner Cable would also face tough regulatory scrutiny.

Comcast is weighing all three options equally at this point and would wait to see what kind of offer Charter come up with before pursuing any one of the options, the person added.

Comcast is being advised by JPMorgan Chase & Co on a potential deal for Time Warner Cable, Reuters previously reported.

Representatives for Comcast, Time Warner Cable and Cox declined to comment. Charter did not immediately respond to requests for comment.

The potential entry of Comcast into a still-developing bidding war could complicate months-long efforts by Charter and its largest shareholder, Liberty Media Corp, to acquire Time Warner Cable.

Charter, the No. 4 cable player in which John Malone's Liberty Media owns a 27 percent stake, is preparing to send an offer letter for Time Warner Cable as soon as this week, valuing the larger rival at below $135 per share, Reuters reported on Friday.

But it remains unclear whether the expected bid from Charter, which would provide little premium to Time Warner Cable's current trading prices, would gain traction with the larger rival's shareholders or its management.

Shares of Time Warner Cable ended 0.5 percent higher at $132.09 on the New York Stock Exchange on Monday. Any bid would need to be at least $150 per share to be considered seriously by the company's board, a person familiar with the company's thinking previously said.

John Malone and Greg Maffei, Liberty Media's chief executive, met with some of Time Warner Cable's largest shareholders in Denver last week and pitched the merits of a combination with Charter, other people familiar with the matter said.

Some of the shareholders, however, told the executives that they would not entertain a deal without a substantial premium, those people said.