Keen to ensure he entered this summer's World Cup in the best possible physical condition, Messi allowed Barça boss Ernesto Valverde to rest him from time to time over the past few months.
"Iceland are a team that showed in the last European Championship that they are hard for anyone".
The five-time Ballon d'Or victor also expressed his views on how fame affects his lifestyle and how he has to miss out on a few occasions with his family, while also admitting that he is thankful for the love he receives.
Spain famously lifted their first World Cup trophy in 2010 after Messi's Barcelona teammate Andres Iniesta netted the victor against the Netherlands during the final in South Africa.
There were two different classes of teams on the field Tuesday, as Argentina controlled the pace, created a number of golden opportunities beyond the four goals and kept Haiti away from goalkeeper Willy Caballero.
And Messi, unsurprisingly, was the star of the show.
Messi, who has spent his whole senior career with Barca, scoring 552 goals, has been linked with Pep Guardiola's Manchester City in the past.
You can watch Messi's highlights here...
Argentina continued to control proceedings as Haiti offered nothing going forward and the South American giants went so close to a stunning goal approaching the half-hour mark when Lo Celso picked out Di Maria with an inch-perfect lofted ball over the visitors' defence, but the Paris Saint-Germain forward's volley sailed just wide of the post. While Messi will face much stiffer competition in Russian Federation than he did Tuesday, he was clearly the best player on the field and is rounding into form before June. "A lot of people are going to travel to Russian Federation with us and we go with a dream". We are not candidates but we are very good, training and improving day by day.
"We have players to be able to dream". But we all want the same thing, to win an important trophy.
"Let no one have doubts that we are going to try everything, as people always ask us". We go to Russian Federation with a great team which is getting stronger on a collective and an individual level. "We are facing a attractive possibility and we are looking for that".
A World Cup throws up results you don't imagine.
Goal 2: Lionel Messi scores his second goal from the rebound to double Argentina's lead.