Daily Star Sport considers four things Thomas Tuchel got right despite the result. Read More: 5 Chelsea stars who had forgotten spells at other English clubs as Fulham chase Willian One defensive colossus has been traded for another as Koulibaly was an imperious presence at both ends of the pitch.
Chelsea had been linked with the 31-year-old ever since Conte was in the home dug-out. But while many Chelsea fans wish he could have been signed earlier, he has certainly been worth the wait.
Many were worried about Chelsea's campaign when Antonio Rudiger departed the club for Real Madrid, but Koulibaly has filled his hefty boots with relative ease.
While he is a physical presence, Koulibaly is one of the most composed and technically astute defenders in the Premier League.
Read more on dailystar.co.uk