Giggs warns United will have to be at their very best to end Stamford Bridge hoodoo Ryan Giggs knows Manchester United will have to stop a flying Chelsea side to end their Stamford Bridge woes. A midweek Champions League blip aside, the Blues have made a superb start to the season and were four points clear at the top of the Barclays Premier League heading into this weekend's action. United are the next side to attempt to cut them down - and they will move within a point of Roberto Di Matteo's men if they do so - but recent history is against them with no league win at Chelsea since 2002. The visitors will take encouragement from last season's recovery from 3-0 down to draw 3-3 - and their 2011 Champions League semi-final win - but the London side, energised by Di Matteo's summer changes, look in prime form. Veteran midfielder Giggs said: 'Sometimes new players settle in straight away and that seems to be the case at Chelsea. 'They've got off to a great start this season, particularly in the league. We're going to have to play well if we're going to get a result. 'I don't know why we've found it so tough (there). In the 1990s we used to go there and win quite regularly. 'Obviously when Jose Mourinho came and they won the league it was always a tough place to go. 'I'm really not sure why it's been so tough for us. Last year