Messi is expected to be fit until the New Year.
He said: "The plan is to resume playing when the body tells me I'm fine."
There were rumours that Messi, who has scored 223 goals for Barca with 14 so far this season, had changed his diet which could have been a contributing factor to his run of injuries.
But he put the record straight, saying: "(That is) not true. My diet is the same as ever. A lot of things have been made up.
"I do the same as always. And I started the pre-season with my ideal weight to reach the end feeling good. Nothing changes."
The four-time World Player of the Year, who has suffered from hamstring issues in the past, believes his recent run of injuries are just down to bad luck.
He added: "I'm sad because I did not expect it and I'm also angry because it is an injury that happened to me right after another.
"I'm not worried, really. This injury happened because it had to happen. There is nothing unusual or anything to look back at.
"A hit, a bad move and I was injured."
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