The Discovery-owned sport broadcaster said the move is in line with its strategy to bring premium content to more viewers on more screens than ever before.
Rivera, who was made redundant by the BBC following a restructure earlier this year, will report to Michael Lang, executive vice president of international development and digital for Discovery Communications.
At Eurosport he has been tasked with leading an aggressive expansion of the broadcaster’s digital businesses, including the website Eurosport.com and Eurosport Player, its subscription-based viewing platform for smart TVs and mobile devices.
At the BBC Rivera was responsible for leading on the implementation and operation of BBC iPlayer. He previously spent ten years at AOL, most recently as senior vice president and managing director of Games, where he is credited with transforming the division from a loss leader to one of AOL’s most profitable media units.
Rivera said: "Having enjoyed numerous successes with the BBC, my next move had to be big.
"The opportunity I have in leading the digital business at Eurosport is an amazing challenge, and working closely with Discovery’s world-class teams at Eurosport and across local markets, I hope to build next generation digital sports products, ensuring Eurosport consumers across Europe can enjoy more action, when and where they choose to view it."