The rights to the NFL's first streaming-only broadcast of a football game are going to Yahoo Inc., as the aging Internet portal makes one of its biggest bets on live content to lure more advertising dollars.

Yahoo said it will make the Oct. 25 matchup between the Buffalo Bills and Jacksonville Jaguars available on any of its digital platforms, whether that is in a Web browser, within a Yahoo app on a mobile phone or on a television with a streaming device.

"Basically any digitally connected user will get it, for free," said Adam Cahan, senior vice president of mobile and emerging products at Yahoo.

The Week 7 game, which will be played in London and shown at 9:30 a.m. Eastern time, will mark a dramatic shift in the league's broadcast strategy, which always depended on traditional network television or a cable channel to air regular season games.

The game is something of an experiment for the NFL, which wants to see how viewers, advertisers and technology companies will respond to games on digital platforms. It also allows the league to reach viewers who don't subscribe to traditional pay-TV. Brian Rolapp, the league's executive vice president of NFL Media, said the test balloon is also designed to get ideas from tech giants on how they would handle game broadcasts. The league—which has teased the idea of a partnership with an Internet company for years—said its only request was that the winning company have a broad reach.

"When we do television packages, we kind of know the rights and how we want to sell them," Mr. Rolapp said. "This is a lot more open as far as the response."

For now, Mr. Cahan said, Yahoo's focus will be to distribute the game without a hitch, but also to explore different ways to engage advertisers. He said the Internet-only broadcast will open the door to nontraditional NFL advertisers who have a relationship with Yahoo or to traditional NFL sponsors seeking a global audience since the game will be available world-wide.

Mr. Cahan said Yahoo will focus on bringing advertising features to NFL games that can't exist on traditional broadcasts like "links to the ads, a companion experience or tracking elements."

Yahoo is betting it on its ability to lure marketers to the streaming game at a time when the overall company is trying to reignite ad sales growth.

The deal adds a high-profile piece of content for Yahoo Chief Executive Marissa Mayer. Mr. Cahan said she was directly involved in negotiations, beating out what the league said was a "who's who" of tech companies looking to broadcast a regular season game.

Both sides declined to comment on financial terms of the arrangement. CBS Corp. pays about $300 million to broadcast eight Thursday games. The NFL already has content deals with Twitter, Facebook and YouTube for game highlights and other video, but they cannot show full games.

The pressure is on for Ms. Mayer to invest in and grow mobile and video advertising fast enough to offset the company's declining legacy businesses of display and search ads on desktop computers. Already three years in, her turnaround effort is faltering as search and display ads both fell in the first quarter for the first time in years.

To help bolster its video and digital platforms, Yahoo has hired stars such as Katie Couric for its news team, acquired former NBC sitcom "Community" and developed other scripted shows, like "The Pursuit," which will launch in 2016. Mr. Cahan compared the NFL game to a live Yahoo broadcast of a recent Taylor Swift concert, which he called an "Internet phenomenon" that was a "flawless consumer event."

A broadcast crew from CBS, which likely would have handled the game if it were a typical regular season matchup, will do the production. The game will still be broadcast on network television in the teams' local markets of Buffalo and Jacksonville.

Mr. Cahan said he hopes the one-game deal will be the start of a long-term relationship. The league and Yahoo both admit there will be no true benchmark for success in this first streaming attempt. The game was never expected to be a ratings bonanza given the timing, location and the two teams, which are not expected to be contenders next season.

"I'm not sure we have any expectations what viewership will be," Mr. Rolapp said. "Our first hurdle for success is that the quality is high for the fan. Other than that, that we successfully learn and to see how we innovate.... We'll know a lot more about this after this year."

Write to Kevin Clark at kevin.clark@wsj.com

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