Champions United are in sixth place, 15 points adrift of leaders Chelsea with 11 games to play."As a group of players, we have to take responsibility for the league position we are in," said Rooney, who signed a five-and-a-half-year deal last week."We're better than that. As a team, it hurts when you know you can do better."United have won two, drawn two and lost one of their last league five games and lie 11 points adrift of Liverpool in fourth place, the final qualifying spot for next season's Champions League."It's important we finish the season strongly and we take momentum into next year but more importantly get into fourth spot and do well in the Champions League," added Rooney.United face Olympiakos in Athens on Tuesday in the first leg of their last-16 Champions League tie.Despite the club's disappointing league form, Rooney remains confident the team can have a strong run in Europe's premier competition."The year Chelsea won it, they nearly went out of the competition about three times," said the 28-year-old, who has been at United for 10 years."We've been excellent in the Champions League this year and hopefully we can take that into the game and that will help us get the result."We've got quality in the team to go far, so hopefully we can do that."United won the Champions League in 2008 and lost in the final to Barcelona in both 2009 and 2011.(BBC)ANN.Az