FILE - In this Sept. 22, 2012 file photo Chelsea's John Obi Mikel plays against Stoke City during their English Premier League soccer match at Stamford Bridge, London. John Obi Mikel has followed Chelsea midfielder Oscar to the Chinese Super League by leaving Stamford Bridge on Friday Jan. 6, 2017 to join Tianjin TEDA. (AP Photo/Sang Tan, File)
Chelsea's Nemanja Matic, left, fights for the ball with Sunderland's Connor Wickham, center, during their English Premier League soccer match at the Stamford Bridge ground in London, Saturday, April 19, 2014. (AP Photo/Lefteris Pitarakis)
Chelsea's Ramires, left, tries to dribble past Sunderland's Jack Colback, right, during their English Premier League soccer match at the Stamford Bridge ground in London, Saturday, April 19, 2014. (AP Photo/Lefteris Pitarakis)
Sunderland's Connor Wickham, no. 10, celebrates scoring against Chelsea during their English Premier League soccer match at the Stamford Bridge ground in London, Saturday April 19, 2014. (AP Photo/Lefteris Pitarakis)
Chelsea's Mohamed Salah, right, is tackled by Stoke City's Marc Wilson during their English Premier League soccer match at Stamford Bridge, London, Saturday, April 5, 2014. (AP Photo/Sang Tan)