International duty is always a bit of a worrying time for clubs, and there is usually at least one big Premier League star who gets injured.
Chelsea fans will be worried to learn the fate of Samuel Eto'o, who has been injured playing for Cameroon in their World Cup qualifier.
Cameroon beat Libya 1-0 in the match, taking them clear at the top of the group.
Eto'o did not complete the match, limping off injured to the concern of Chelsea fans around the globe.
The extent of the injury or exact nature is unclear at this early stage, and fans of the Blues will be desperately hoping it is not too serious and he can make a swift recovery.
Eden Hazard and Oscar have also suffered injuries over the past week and new signing Eto'o could now join them in missing next week's Premier League clash against Everton.
Eto'o signed for Chelsea from Anzhi Machachkala prior to the transfer deadline, and is yet to make his debut for the club.
His injury certainly makes the decision to loan out Romelu Lukaku look more risky, but also making Demba Ba stay a good decision. Chelsea could be reliant on Fernando Torres once again next weekend.
Are you worried? How much of a setback could this be for Chelsea?
image: © Jason Bagley