New Chelsea boss Antonio Conte has hailed his side's pre-season preparation, and is keen on sorting out their defensive problems.
The former Italy boss wasn't pleased with the mistakes made at the back in the Blues’ 4-2 friendly win over Werder Bremen as he believes there is a lot of work to be done defensively.
"There were some bad situations to concede two goals which I didn't like," Conte told Chelsea's official website.
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"We must improve a lot, but we were tired after our pre-season, it was a good victory.
"We've finished our pre-season, it was very tough and hard in all aspects and we must be pleased to finish with a win.
"We are working very hard to be ready, it will be difficult, we know we have some problems but we are trying to solve them.
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"I saw positive things and many situations that we can improve. We are working on this. Now there is only one week left of work before the season starts."
The Blues host West Ham at Stamford Bridge on August 15 - Chelsea's Premier League opener.
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