Chelsea hero Roberto di Matteo has praised manager Thomas Tuchel for his work in the market.
Di Matteo who's been impressed by Tuchel's recruitment of Raheem Sterling and Kalidou Koulibaly.
He said: "Tuchel is the best man to assess what he needs and what the squad needs.
"The two signings so far have been absolutely brilliant for the club. I think they've done very well.
"Two great players, top quality players. They're already part of a very successful team but the talent and the skills they bring could unlock defences for the club and it's going be a very big asset.
"Also Koulibaly is a very technical centre half, physical, but he knows how to play out from the back and he's a big leader as well."
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