By Jamie Spencer Chelsea defender Thiago Silva has hinted that he could soon leave the club when his contract expires at the end of the season, now just a few short months away. Silva signed a one-year extension to his deal last February. But having signed new 12-month deals regularly throughout his time at Stamford Bridge, the Brazilian centre-back doesn’t appear likely to extend into a fifth year given his latest comments to reporters. Silva was speaking after Chelsea’s 6-1 thrashing of Middlesbrough in the Carabao Cup semi-final second leg, admitting he feels as though his time wearing blue…