text: Jose Mourinho has lauded Chelsea's consistency, with a hint of caution, as his side bid to wrap up a wire-to-wire Premier League victory. The Blues have led or shared the lead since the opening round of fixtures and entered this weekend's matches seven points clear with eight matches remaining, beginning at QPR on Sunday. 'To be top of the league since day one shows consistency, stability, confidence and a brave approach to every game,' Mourinho said. Chelsea have topped the Premier League since the opening day but Jose Mourinho (left) will remain focused . Blues captain John Terry has been a pivotal figure in keeping the west Londoners in consistent form . Diego Costa celebrates his goal in Chelsea's 3-1 win against Burnley on the opening day of the season . 'We are there, we deserve to be there, but every game is difficult. And we still have eight matches to play.' Mourinho knows the Premier League - a championship more competitive than Italy's Serie A or Spain's Primera Division, in his opinion - can throw up twists and turns in the closing weeks. The Blues boss was not surprised to see holders Manchester City slip up at Crystal Palace last Monday to all but end their title hopes. Crystal Palace striker Glenn Murray opened the scoring in the Eagles' surprise win against Manchester City . Jason Puncheon curls his free kick over the Manchester City wall in Palace's 2-1 win at home on Monday . Mourinho added: 'This is the Premier League. In other competitions it's difficult to believe that the top team can lose four, five, six, seven matches. 'In almost every country it's very difficult for a top team to lose so many matches. 'Here, yes. It's possible. I'm not surprised. It's happening to everybody. Everybody loses matches, everybody loses points.' Mourinho will hope Chelsea are not among them at Loftus Road.
target: Jose Mourinho praised Chelsea's consistency since the opening fixtures .
  The Portuguese said the Premier League's competitiveness is like no other .
  Chelsea face QPR on Sunday as they look to maintain league stronghold .