Lautaro Martinez came off the bench to earn Inter a hugely important 1-0 victory over nine-man Napoli in Serie A on Wednesday. 

The game appeared to be heading for a goalless draw before Martinez fired home from the centre of the box in additional time, with Kalidou Koulibaly having been sent off with 10 minutes remaining after picking up two bookings in quick succession. 

Napoli finished the game without Lorenzo Insigne too, the forward shown a straight red card for violent conduct following a confrontation with Keita Balde Diao. 

The win is just Inter's second in five Serie A matches and eases the pressure on coach Luciano Spalletti.