Postpublished at 16:00 Greenwich Mean Time 6 January 2020
Thanks for joining me this afternoon. There's more football on the BBC website today, with Arsenal v Leeds in the FA Cup at 19:56 GMT. You can watch that game with us if you are in the UK.
Summary
Ibrahimovic comes on as AC Milan sub after signing six-month deal
Champions Juventus beat Cagliari thanks to Ronaldo hat-trick
First treble in Serie A for Portuguese forward
6 January is public holiday in Italy - hence daytime games
Postpublished at 16:00 Greenwich Mean Time 6 January 2020
FULL-TIMEpublished at 15:56 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
It's all over. There is no debut goal for Zlatan Ibrahimovic. AC Milan remain in 12th place.
Postpublished at 15:56 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Ten seconds to go.
Postpublished at 15:56 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Another great headed flick by Zlatan Ibrahimovic to Rafael Leao, who is tackled just before he can shoot.
Postpublished at 15:55 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Zlatan Ibrahimovic flicks on a long ball with his head but it runs through to the keeper.
Postpublished at 15:54 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
AC Milan cross from the left but the Samp keeper catches before Zlatan Ibrahimovic can score.
Postpublished at 15:53 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
I can't actually remember Zlatan's last touch.
INJURY TIMEpublished at 15:53 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Four minutes added on. Plenty of time for a Zlatan winner surely.
FULL-TIMEpublished at 15:52 Greenwich Mean Time 6 January 2020
Juventus 4-0 Cagliari
It's all over. Cristiano Ronaldo's first Serie A hat-trick sends Juventus to the top of the table.
Although Inter Milan can go back to the top if they beat Napoli at 19:45 GMT.
Postpublished at 15:50 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Samp are now looking for a late winner but Jakub Jankto's first touch lets him down on the edge of the box.
Postpublished at 15:48 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Still four minutes left at San Siro as they enter injury time at Juventus.
Postpublished at 15:48 Greenwich Mean Time 6 January 2020
Juventus 4-0 Cagliari
Cristiano Ronaldo is the second player to score a Serie A hat-trick, a La Liga hat-trick and a Premier League hat-trick this century, after Alexis Sanchez.
SUBSTITUTIONpublished at 15:47 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Milan bring on Lucas Paqueta for Rade Krunic.
On comes Zlatan Ibrahimovic's former Sweden team-mate Albin Ekdal for Sampdoria. Off goes captain Fabio Quagliarella.
Postpublished at 15:46 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Nope, the Milan keeper catches the corner and launches them straight into an attack.
Postpublished at 15:45 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Sampdoria have a corner now. Could Claudio Ranieri's side grab a goal against the run of play?
Postpublished at 15:43 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Zlatan Ibrahimovic has barely been involved after his quick flurry of touches after coming on.
Postpublished at 15:42 Greenwich Mean Time 6 January 2020
AC Milan 0-0 Sampdoria
Milan would love just one of these Juventus goals. They are completely dominating but can't find the breakthrough. Emil Audero did well to keep out Hakan Calhanoglu's long-range shot.
Postpublished at 15:41 Greenwich Mean Time 6 January 2020
Juventus 4-0 Cagliari
Cristiano Ronaldo's last league hat-trick was for Real Madrid on 18 March 2018 in a 6-3 win over Girona. In fact he scored four that day.
GOAL - Juventus 4-0 Cagliaripublished at 15:40 Greenwich Mean Time 6 January 2020
Cristiano Ronaldo hat-trick (82 mins)
It's Cristiano Ronaldo's first Serie A hat-trick!
He's picked out in space by Douglas Costa before slipping the ball under the onrushing goalkeeper.
GOAL - Juventus 3-0 Cagliaripublished at 15:38 Greenwich Mean Time 6 January 2020
Gonzalo Higuain (81 mins)
Game over.
Two goals and an assist for Cristiano Ronaldo. He feeds Gonzalo Higuain down the left and the substitute cuts in before having a shot deflected past the goalkeeper.