The former Torino defender hit a screamer during th 6-0 Champions League rout.
“I'll be honest, I wanted to cross, then I hit the ball fully with my instep," he told Premium Sport.
“I'm really happy. It was a dream debut, with a goal at Stamford Bridge.
“I'm happy for myself but especially for the win, which allows us to start well in the Champions League. Our objective is to go as far as possible.
“We're working hard to qualify for the group stage and reach the knockout stages.
“There's an open group here and they've greeted me well, I hope it stays like this."
Blues boss Antonio Conte added after the game: “He told me he was attempting a cross."