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Middlesbrough have completed the signing of former Chelsea midfielder John Obi Mikel.

The 31-year-old, who won the Champions League with Chelsea in 2012, was a free agent after leaving Chinese side Tianjin Teda last month. 
 
The Nigeria midfielder made 249 Premier League appearances for Chelsea in an 11-year spell where he also won two league titles, three FA Cups and the Europa League in 2013.