Mean Broadcast, which launched in 2010, will have responsibility for managing airtime sales, channel and programme sponsorship, and brand partnerships working with media and ad agencies. The new contract begins with immediate effect.
It follows Discovery Communications’ agreement in July to buy the full ownership of Eurosport, the pay-TV sports channels network that operates across Europe and Asia.
Discovery took a 20 per cent stake in Eurosport in 2012, increased its investment to 51 per cent in 2014, and this year bought the remaining 49 per cent from TF1 Group for £349.2 million.
Martin Heaton Cooper, the vice president of commercial development for UK and Ireland and international advertising sales, EMEA, said: "I was really impressed by the approach, creativity and entrepreneurial spirit of Mean Broadcast.
"They have a fantastic track record and are the ideal partners to enable brands to reach our passionate TV audiences around the best of domestic and international sport."