Chelsea goalkeeper Thibaut Courtois admits defeat to Arsenal was a low point of the season.

After good start to the season under new coach Antonio Conte, Chelsea suffered a three-game winless run when they drew 2-2 away to Swansea, lost 2-1 at home to Liverpool and were then comprehensively beaten by Arsenal at the Emirates Stadium in late September.

"That defeat to Arsenal hurt us but we've come back stronger with the new tactics and system," he told Chelsea's website.

"It works well, everybody is doing their job and we keep on winning. The spirit is very important."