Mikel John Obi has paid tribute to Chelsea owner Roman Abramovich.

The Russian billionaire celebrated his 50th birthday on Monday.

Obi tweeted:

Source: http://www.tribalfootball.com/articles/mikel-john-obi-abramovich-ambition-took-chelsea-to-new-level-4152276?utm_source%3Dmediafed%26utm_medium%3Drss-feed%26utm_campaign%3DFeed-Latest%2BArticles%2Bfor%2BChelsea