The team came from behind to defeat Iceland 2-1 in their playoff final in neutral Poland on Tuesday
Cesc Fabregas scored his first goal for Chelsea to put them ahead after 11 minutes but the London side, who have won all four Premier League games, were pegged back when Klaas-Jan Huntelaar scored a superb equaliser for Schalke who are without a win in Germany this season.
Fabregas was fortunate Croatian referee Ivan Bebek allowed play to continue after he appeared to foul Max Meyer at the start of the move that led to his goal which came when he fired past goalkeeper Ralf Fahrmann with a lofted angled drive.
But justice appeared to be done when he lost the ball at the start of the move that led to Schalke's 62nd minute equaliser which Huntelaar fired in from the edge of the box.