Krzysztof Piatek netted twice on his full AC Milan debut to send his new side into the Coppa Italia semi-finals.

Piatek, who joined Milan from Genoa last week for a reported €35m euros (£30.6m), scored both goals inside 27 minutes to help Milan beat Napoli 2-0.

"I expected a night like this, I said that I was ready and today I got a brace," Piatek said. "And this is just the start. Both goals were great, even if they were different. Today went well but I already have my mind on the next match against Roma. ... I only want to score goals and I repeat, I feel good and I was born ready."

The Poland forward came off the bench against Napoli in the league last weekend for the final 19 minutes of a 0-0 draw.

He was given his first Milan start at the San Siro and it took him less than 11 minutes to open his Rossoneri account.

Nikola Maksimovic allowed a long ball from Diego Laxalt to bounce and Piatek ran into the area and drilled it into the bottom right corner.

Piatek's second was even better as he controlled the ball on his chest, cut inside Kalidou Koulibaly and curled a shot between the defender and Maksimovic, into that same far bottom corner.

Piatek, 23, is the cup's top scorer, having netted four earlier in the season on his debut for Genoa against Lecce and another two against Virtus Entella, when his old side went out on penalties.

The Rossoneri will play either city rivals Inter Milan or Lazio in the semi-finals, with the pair going head to head on Thursday.

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