Chelsea will have to reschedule two Premier League games and possibly a FA Cup tie after their Club World Cup campaign was scheduled between February 3 and 12.
The Blues will travel to the United Arab Emirates for the FIFA tournament, which they must participate in as a reward for winning the Champions League in May.
The timing of the tournament means Chelsea will see their trip to Brighton on February 8 and their home clash against Arsenal on February 12 rearranged, plus a FA Cup fourth round fixture on February 5 should they qualify.