Modric, though, accepts the test against Jorge Sampaoli's side will be a step up.
In a post match interview, Rohr admitted his players were aware they made a lot of mistakes that cost them in the match.
An own goal from Oghenekaro Etebo broke the deadlock just after the half-hour mark, before a penalty from Modric secured three points for Zlatko Dalic's men.
Nigeria will face Iceland in their next game.
"We know we made some mistakes, too many important mistakes, and it is clear that we need to get better in order to move on", News Agency of Nigeria reports.
Hazardous weather outlook: Lehigh Valley to sizzle as heat, humidity build
A unsafe combination of heat and humidity will be in the region Fridayafternoon and continue at least through early Sundayevening. Because of these high temperatures, the NWS is urging people to look for signs of heat-related illnesses.
He said the entire team was disappointed at the result, adding that they needed to work on being professional with the set-pieces.
More solid hold-up play from Mandzukic fed Ante Rebic, whose effort deflected wide, with Croatia scoring the opening goal from the resulting set-piece in the 32nd minute.
"Having lost the opening match, it has become more hard to qualify for the next stage, with two compulsory wins in the remaining two group matches, " Mr Alex Ubagana said, adding "I am scared for us".
"I think the young guys did well but we just have to keep going and trying to get better", he added.
The Super Eagles lost two goals to nothing courtesy of an own goal in the first half of play and a penalty in the second half.
India vs Afghanistan: Two-day win shows gulf between the sides
But the rain being a reoccurring enemy, the day was constantly interrupted, and it slowed down India's momentum. Hashmatullah Shahidi put the brakes on by striking an unbeaten 36 off 88 deliveries but ran out of partners.
"They (Argentina) have quality but this win will boost our confidence and I hope we can play well against them", Modric, who excelled in his role as a playmaker, told reporters.
"But, he couldn't have done better than he did today, because of the quality of those he was playing against. This will lift us to continue our journey", said Real Madrid midfielder Modric.
Rohr also stressed Alex Iwobi substitution was a tactical one and not because he had a poor performance.
"We will improve because it is important for us. Croatia were the better team, but we could have come back into it in the second half when we started very well before the penalty against us", he said.
"I believe that on the wings of this win we will up our game and continue our journey in the way that we planned before coming here".
Cyberpunk 2077 is a First-Person RPG, Become 'Urban Legend', V
This immersiveness carries over to the game's dialogue system, which sees dialogue options popping up when looking at a character. Strength, Reflexes, Tech, Intelligence, Constitution, and Cool are the stats you can select from at the beginning.