Willian is delighted David Luiz returned to Chelsea in August.
The Brazil midfielder admits they're good friends.
Willian told France Football: "I was so happy that he joined us. It's like he was coming home. We've known eachother since we were toddlers. Our friendship comes from far away, I was eight.
"At the time, he did not have that tuft on his head. Me neither, moreover, had short hair and I was tiny.
"I hope he will soon find his place in the team, we need him. He signed in the transfer window in stoppage time, but I knew for a few days already. It's funny, because for his passage from Benfica to Chelsea, he also signed on the last day of the transfer window. That's his specialty!"