Ingvild Flugstad Østberg leads the women's standings ©Getty Images

Ingvild Flugstad Østberg of Norway and Switzerland's Dario Cologna will look to retain their respective leads in the Tour de Ski when action resumes for the final two legs tomorrow in the Italian resort of Val di Fiemme.

Two mass start classic races are scheduled for tomorrow - over 15 kilometres for men and 10 kilometres for women - before action concludes with 9km pursuits for both fields on Sunday (January 7).

It follows previous legs in the Swiss resort of Lenzerheide and then in Oberstdorf in Germany.

Each leg is doubling as a stop on the International Ski Federation Cross-Country World Cup series.

Østberg leads the women's standings by 57 seconds after winning yesterday's 10km mass start free race in Oberstdorf.

Dario Cologna tops the men's standings heading into the final two races ©Getty Images
Dario Cologna tops the men's standings heading into the final two races ©Getty Images

Fellow Norwegian Heidi Weng lies second, 57 seconds behind, with United States' Jessica Diggins third, 1:56.7 behind. 

Cologna leads the men's standings despite finishing fourth yesterday. 

He now lies 53 seconds in front of Russia's Sergey Ustiugov.

Martin Johnsrud Sundby of Norway lies third overall, 1:07.60 behind.