Ralph will redesign the main to reflect the channel's tagline, "dead good sport".
The new site is being launched on August 24 to coincide with the Rugby World Cup, and ESPN Classic will push the revamp through on-air, online and off-line promotions.
Ralph will develop the site in four versions, aimed at French, Italian, European and UK audiences, with localised content in Dutch, German, Polish and Portuguese.
will conduct research to ensure the site remains user-friendly, and will target ESPN's core audience of 25-45-year-old males. Interactive elements will be more prominent on the site to drive repeat visits.
Xavier Perrin, new media manager at ESPN Classic, said: "We are committed to delivering entertaining content and we are confident that the upgraded site will help to engage and interact with visitors and, at the same time, promote the channel."
Ralph's other broadcasting clients include Channel 4 and Nickelodeon TV.