Following a three-way pitch, Ketchum London was selected for the account due to its football credentials and its ability to bring to life the sponsorship deal for Nissan consumers.
It is understood that Ketchum will be running an integrated PR service for Nissan including brand and corporate PR and working with other agencies, including sister Omnicom shops TBWA on advertising and OMD on media buying.
Nissan succeeds Ford's 22-year sponsorship of the Champions League. It is the Japanese car maker's largest ever sponsorship deal, will run for four years and includes the UEFA Super Cup.
As an official partner, Nissan will have extensive rights to the matches, pre-match training sessions, content, media, hospitality, events and the final.
Clare Pring, partner and managing director of Ketchum's UK Brand Practice, will be leading on the account.
She said: "We’re very pleased to be working with such an ambitious client on one of the most exciting competitions in football. I’m really proud that we’ve been chosen to provide this support."