The four-time world footballer of the year who boasts of 37 goals in 83 appearances for the South American giants has been on and off injury this season and the national team gaffer believes there would be no Plan B for the forward should injury rule him out.
“You always have to have a Plan B. The thing is that we’re talking about top players here. You have to have some kind of list in your head and have some possible replacements in mind,” Sabella told Fifa.com.
“The thing is, there are times when Plan B is pretty similar to Plan A, and there are times when it isn’t. That’s when you have to adapt.
“We’ve played a few games without Leo, but the fact is that he’s irreplaceable. There’s not a club or national team in the world that could play the same with or without Messi.
“We rely on him so much that when he’s not there, we notice it. If it did happen, we’d have to see how we’d handle it and look at the match in question.
“We do have an idea, though. In fact, he wasn’t there when we played Italy in Rome and neither was [Sergio] Aguero and yet we still managed to adapt to the situation. We’re never going to be the same, but we’d do it again if need be,” he concluded.
Argentina begin their 2014 World Cup campaign against Bosnia and Herzegovina on June 15, 2014 at the Estádio Jornalista Mário Filho before playing Iran then Nigeria in their final Group F game.