Ferguson worried by errors

Sir Alex Ferguson's fears Manchester United's Premier League title bid could be wrecked by a refereeing decision at Old Trafford next Sunday.United now face a crucial encounter with Chelsea just three points ahead of the Londoners following today's 1-0 defeat at Arsenal.Less than 24 hours after Chelsea profited from two errors by match officials to record a 2-1 win over Tottenham, Ferguson felt his own side were denied the chance of a point at the Emirates when referee Chris Foy failed to spot Gael Clichy's foul on Michael Owen."It's too big a game not to get the decisions right, Ferguson told Sky Sports News."Clichy knew. He put his hands up in horror. Obviously, it gives Chelsea a major chance now. That's what happens when you get these decisions."They got one at Old Trafford last season so that's the worry now."