CHENNAI: Reliance-Anil Dhirubhai Ambani Group (R-ADAG) has signed up Indian cricketer Mahendra Singh Dhoni as the brand ambassador for Reliance Communications Ventures Ltd. Under the terms of the contract, the cricketer will endorse the company'sk products and services through advertising campaigns and other such promotional programmes that may be evaluated for brand fitment. Mr. Dhoni's contract provides for his utilisation for brand endorsements for Reliance Energy also, says a release.