Chelsea are facing a fixture concerns after FIFA announced the Club World Cup dates.
Thomas Tuchel will take his team to the United Arab Emirates for the tournament between February 3 and 12.
That means the Blues' games away at Brighton and at home to Arsenal will have to be rearranged.
Seven clubs will take part in the Club World Cup, the six winners of each confederation's continental cup and the UAE league champions.
Alongside Chelsea in the tournament will be Al Hilal, Al Ahly, Monterrey, Auckland City, Al Jazira Club and Palmeiras.
The Londoners enter the competition in the semi-finals, on the opposite side of the draw to Copa Libertadores winners Palmeiras.