The 37-year-old won his 162nd cap in the 2-1 win over Morocco, four years after helping his country to the World Cup runners-up spot behind France.
Croatia will now attempt to win the Nations League title next June in the four-team finals also featuring Netherlands, Italy and Spain.
"That's the plan," said Modric when asked if he intends to keep playing international football.
"It would be a nonsense not to play in the Nations League, and then we'll see how to proceed. I definitely want to stay for the Nations League."
Croatia were defeated by a Lionel Messi-inspired Argentina in the World Cup semi-finals but Modric insisted that his team have cemented a place amongst the heavyweights of the sport.
"We achieved something major for the Croatian football. We wanted the gold, we were close," he told broadcaster HRT.
"In the end, we return to Croatia as winners. Croatia is not a miracle that appears every 20 years. We proved that we are constant, that we cannot be seen as dark horses but as a football power."
