There is never an ideal time to take on Chelsea at Stamford Bridge but tonight, when West Bromwich Albion are the visitors, might just be one of those occasions when the Premiership champions are vulnerable.
Bryan Robson, the Albion manager, cites two reasons for believing that his team can cause a surprise: Chelsea's moderate start and Albion's inherent enthusiasm.
It will probably need more than that - Chelsea rarely concede goals these days - but Albion play well against the better teams, having drawn 1-1 away to Arsenal and Manchester United last season.
Chelsea have begun the season with 1-0 victories over Wigan Athletic and Arsenal but they have been short of their best in both matches. Against Wigan, they needed a goal deep into stoppage time at the end by Hern?n Crespo to secure a fortuitous victory.
Albion have drawn 0-0 away to Manchester City and defeated Portsmouth 2-1 at home. Four points from two matches is a cause for optimism for a team who flirted with relegation for most of last season.
"Is it a good time to play Chelsea? I think so, for two reasons," Robson said. "I don't think they are on top form and playing real flowing football which where they were at at the end of last season.
"But the main factor is that our lads are so buoyant. They are a confident lot at the moment because of the run they've been on and so it's a good time for us to go and play what is probably the best team in Europe.
"We know it is going to be a hard challenge for us but you've got to play them sometime and I think this is a good time for us to play them at the moment. You can to these places and make it really difficult for them. Our lads now have a bit of belief that they can now go to these sides and compete well.
"Last season we earned a draw at Old Trafford and Highbury while Chelsea only beat us by default because Geoff Horsfield had a perfectly good goal chalked off before they had scored.
"You go there with nothing to lose because everyone expects you to get beaten. It is difficult for people to compete with them when Chelsea can buy the best players in the world. But they have set the standard and it's up to you compete against that as best as you can.
"Although they have not been as flowing, the one thing you've got to say is that Chelsea are a really solid team and they don't look like conceding too many goals.
"That's an area in which we've got to try and break them down and score a goal.
"It will be tough but it's a game we are looking forward to.
"It's important you try to score in games like this because if you do sit in there really defensively, then they've got the quality of players to probably break you down."
Robson says that all the leading sides, and not just Chelsea and Jose Mourinho, will have problems in keeping top-notch players happy who are not in the side. He has a similar situation at The Hawthorns with six strikers vying for two places.
"I think he [Mourinho] has got more of a problem keeping his players happy then I possibly would have here because you are signing topdrawer international players," Robson said.
"Trying to keep top-drawer international players happy when they are not even on the bench is obviously a difficult task.
"I wouldn't take kindly to being on the bench or sitting in the stand but the tempo of the game and importance of matches has gone up that extra bit because of the financial rewards for staying in the Premiership or winning things like the Champions League.
"Manchester United, Arsenal, Liverpool will experience the same. The teams that are competing for the championship will experience the same thing so Chelsea aren't going to have that problem to themselves."
Robson has a fully fit squad from which to select a starting line-up as he decides whether or not to keep faith with Geoff Horsfield, the former Birmingham City striker, who scored the Albion goals in the victory over Portsmouth.