The Liga champions' new manager is hoping that "everything will go perfectly" following confirmation on Tuesday that he will succeed Tito Vilanova at the Catalan club
The trainer was confirmed as the new Camp Nou boss following Tito Vilanova's shock resignation over health problems as he continues his battle with cancer.
Martino, who steps down as Newell's Old Boys boss to take the two-year deal in Catalunya, is thrilled to get the opportunity coach Lionel Messi and hinted that the four-time Ballon d'Or winner was heavily influential in him being hired.
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"I don't know the details of how they chose me. But I have no doubts that Lionel and [his father] Jorge have influenced and gave their opinion to the club.
"How much they did I don't really know but I just want to thank them as much as every single person around football in Argentina."
The former Paraguay head coach is crossing his fingers that he can achieve perfection at Barca and revealed his enormous pride at being given the opportunity to take charge of the reigning Liga champions.
"I'm really happy that Barcelona considered me and my way of working," Martino added. "I have hopes that everything will go perfect and, despite the [high] expectations, that everything will go great.
"There are some things I prefer not to talk about, but I can't stop saying how proud I was when I received the phone call and how proud I am to work in Barcelona. I really wasn't expecting this.
"My first goal is to get adapted to the club with my people the best way. Then we have to fight for every competition we play. One of the points we still have to solve with Barcelona is if I will have the same assistants.
"We are deciding how we will proceed [regarding linking up with the Barca squad]. I guess in the next few hours I will prepare everything to fly as soon as possible. This afternoon we will decide that."