Sir Alex Ferguson fears "one bad week" will cost Manchester United their chance of glory this season. United head towards their final game with Stoke still nursing a chance of becoming the first team to win four league titles on the trot. Even a victory against Tony Pulis' men will not be enough unless Wigan become only the third side this season to take points off Chelsea at Stamford Bridge. The "hope" Ferguson expresses is without conviction, and there seems little doubt United will have cause to lament the disastrous eight-day period in which a home defeat to Chelsea split the shattering disappointment of a Champions League exit to Bayern Munich. "A bad week might have cost us everything," said the United boss. "The biggest disappointment was the European Cup. It's an absolute travesty because we were the best team. "We had a good opportunity to win it but we took the disappointment into the first half against Chelsea."