Apart from the Hammersmith Apollo, which was previously managed by Clear Channel, the sites were not previously represented.
Opportunities on offer will include bespoke media, experiential and pop-up installations.
The contract will initially run until September, covering the Olympics.
Ryan Horn, managing director of SEI Media, said: "SEI Media, as a proven innovative media business consultancy, is looking forward to working closely with Mama Group to deliver impactful and inspiring media, and experiential activation with great brands and clients this summer."
, which challenged fans to spot avatars of players such as Mario Balotelli and Sergio Aguero, in a picture of the crowd.
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