Chelsea striker Diego Costa has agreed a summer deal to join Chinese club Tianjian Quanjian, according to reports. The Blues forward has been linked with a move away from the Stamford Bridge following reports that he is frustrated at the harsh officiating by referees in the Premier League. Last summer window, there were reports that the 28-year-old met with his former club, Atletico Madrid which fell through due to the resilience of the Blues to keep their star player and Costa also confirmed that he 'did all I could' to return to Spanish La … [Read more...]