Chelsea full-back Branislav Ivanovic has warned his team-mates that things will get tougher for them when they face the likes of Tottenham and Manchester United after the international break.
Last season's Champions League winners look the real deal in the Premier League so far this season, and maintained their perfect home record with victory over the Canaries at the weekend.
Ivanovic found the scoresheet with Chelsea's fourth – his third goal of the campaign coming through an excellent volley after Juan Mata's assist.
But the 28-year-old believes Chelsea cannot get too carried away by their early season form, which has taken them to the top-flight summit heading into the international break.
After that, Chelsea travel to Tottenham and then Shakhtar Donetsk in the Champions League, before hosting Manchester United twice in the space of three days for Premier League and League Cup clashes.
'At the moment, a lot of things are OK,' said Ivanovic.
'But we still have to work hard and it's going to be very tough.
'We expect after the break a very hard period of games and we have to be ready for that.'
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here