Thomas Tuchel has spoken about his latest signing in an interview with Sky Sports and said this shows the ambition of the club.
"It was the number one priority and we are very excited and super happy that we could make it happen," said Tuchel.
"He's a big improvement to our squad and is exactly what we were looking for in terms of age, experience, and style of play.
"Once the players arrive these days in a situation where they only have one year [left on their] contract, there's always room for negotiation and possibility. We went for it. We could convince him very quickly. He was convinced, he did everything that was needed to do, we gave our best to make it happen. It's a perfect fit.
"He gives us a lot of flexibility, mobility and attacking options at the front."
"The signing of Raheem shows what we're capable of doing, it shows the ambition of the club and the ownership and it's good because we're all here to win and compete.
"We love to compete and we love the challenge at the very top. For that we need signings of new quality players or otherwise there's no chance."
Chelsea are expected to seal the Koulibaly deal today or tomorrow and the defender is in London for his medical and contract signing.
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