And if their early Premier League form is anything to go by, Schalke should be afraid.
The Blues top the Premier League with a 100 per cent record - sweeping aside all opposition on their way to early perfection.
Of course one of the catalysts behind this recent form is their new striker, £32 million man Diego Costa.
His hat-trick at the weekend against Swansea City took his record for the campaign to an incredible seven goals in four games - a record breaking beginning to a Chelsea career.
So Schalke are of course going to be very wary of the former Atletico Madrid star. But one of their players has also stressed the need to be concerned about more than just Costa.
Denis Aogo is likely to be featuring on the left-hand side for Schalke this evening and he has reminded his team-mates and fans of the club that the likes of Eden Hazard, Cesc Fabregas and Oscar will also pose a significant threat:
"In Germany, we have seen that Diego Costa has managed to start the season well. But they are not just about him. The whole team has played very well and because of this reason they are currently at the top of the Premier League. We will fight a bunch of the world's best players so we do not need extra motivation to try to beat them again..."