Jose Mourinho has thickened up his Chelsea midfield for Sunday's west London derby at QPR. The Chelsea manager has been trialling a formation with Ramires and Nemanja Matic in front of the back four as the league leaders head to Loftus Road. Mourinho has stuck with the team that it is likely to mean a more advanced role for Cesc Fabregas in the 'No10' position behind Didier Drogba up front, with fellow striker Loic Remy out injured. Brazilian midfielder Oscar has failed to complete 90 minutes in any of Chelsea's last 11 games . Eden Hazard, who Mourinho believes is the only realistic candidate to be named PFA player of the year, starts on the left. Willian will start on the right and his Brazilian team-mate Oscar may drop out of the starting line up for the clash at QPR. Chelsea are four points clear of Arsenal with two games in hand and Mourinho does not want to take any chances at Loftus Road. Chelsea's Nemanja Matic (right), in action against Stoke, is set to feature again in the heart of midfield . Oscar was disappointing during last weekend's win, and Mourinho hit out at his performance afterwards . Ramires (left) is set to be restored to the Chelsea midfield for west London at QPR on Sunday . Oscar hasn't scored for Chelsea since the middle of January after an alarming dip in form for the Blues .
Oscar was withdrawn at half-time in win over Stoke City last weekend . Chelsea boss Jose Mourinho criticised Oscar publicly after Stoke game . Brazilian midfielder has not completed 90 minutes in last 11 games . Jose Mourinho's side visit QPR in the Premier League on Sunday .