The spirited home team was putting up a good fight throughout the game in front of a capacity crowd but appeared overwhelmed by the more experiences Portuguese.

Nani finally broke the deadlock ten minutes from regular time, cutting in from the right and arrowing a left-footed shot into the far corner.

Maribor tried hard to equalise but it was not until Luka Zahovič, the top scorer in the national league, entered the field in the 83rd minute that the fortunes changed.

The 18-year-old son of Maribor sporting director Zlatko Zahovič scored the equalised in extra time in a Champions League debut coming 13 years after his father played for Valencia in the final.

The draw was in no small measure due to the experienced keeper Jasmin Handanović, who deflected ten shots on his goal.

Maribor will play their next game in Gelsenkirchen on 30 September, facing Schalke 04, which drew Arsenal 1:1 in the second Group G game of the day.