The three-time road world champion announced his goals for the 2019 season at Bora-hansgrohe's team camp in Mallorca.
"I will be racing in Australia (Tour Down Under) and also in Argentina (Vuelta a San Juan Internacional) at the beginning of next year," Sagan said in a team statement. "And so will begin my season in Europe a bit later.
"My goals, however, remain unchanged: San Remo, Flanders and Roubaix, but I will also ride Amstel and Liège. After the Classics, I will once again prepare for the Tour de France.
Watch Sagan in action at the Tour of Flanders, Paris-Roubaix, Amstel Gold and Liège - Bastogne - Liège with SBS. Details TBC.
"With the addition of Jempy (Drucker) and Oscar (Gatto), we have been able to strengthen our squad for the Classics."
Sagan first raced Amstel Gold in 2011, hitting his highest position there in the 2012 edition (third) and after 2013 did not race it again until this year where he finished fourth.
But he has never raced Liège - Bastogne - Liège. So we're likely in for a treat.
Watch Sagan in action at the Tour of Flanders, Paris-Roubaix, Amstel Gold and Liège - Bastogne - Liège with SBS. Details TBC.