The deal gives Airtel permission to use the club's merchandising, hospitality and content rights in Nigeria, Zambia, Ghana, Uganda and Rwanda, giving the Gunners the potential to reach 42 million fans.
The north London club are also set to support the Airtel Rising Stars programme, which offers young children the chance to play football alongside Uefa-trained coaches.
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"This underlines the depth of our following in Africa and how the profile of the club continues to grow internationally."Arsene Wenger's side kick off their tour with a game against the Nigerian national team in Abuja on August 5.