Jon Obi Mikel has signed for Middlesbrough on a short term deal until the end of the season.
The 31-year-old became a free agent in November after a two-year spell in Chinawith Tianjin Teda and will boost the promotion chances of the Championship club
Mikel, who spent 11 seasons at Stamford Bridge, passed his medical with Tony Pulis' side without a hitch after agreeing personal terms
Crystal Palace were another club linked with a move but Mikel will bolster Pulis' ranks.
A part of the furniture for more than a decade at Chelsea, he won two Premier League titles, three FA Cups and the League Cup at the club.
He also tasted success on the biggest stage with the Blues as he won both the Champions League and Europa League
Middlesbrough are currently fifth in the Championship and Mikel is the second signing of the transfer window after Rajiv van La Parra arrived on loan from Huddersfield