The Inter Miami star featured in Argentina's World Cup qualifying win against Venezuela earlier today.
The match marked his last competitive game on Argentine soil.
Afterwards, Barcelona legend Messi stated: "Same as I said before about the World Cup that I don't think I'll play another.
"Because of my age, the most logical thing is that I won't make it. But well, we're almost there, so I'm excited and motivated to play it.
"Like I always say, I go day by day, going by how I feel.
"I'm trying to feel good and, above all, being honest with myself. When I feel good, I enjoy it, but when I don't, honestly, I don't have a good time, so I prefer not to be there if I don't feel good. So we'll see. I haven't made a decision about the World Cup.
"I'll finish the season, then I'll have preseason, and there will be six months left.
"So, we'll see how I feel. Hopefully, I'll have a good preseason in 2026 and finish this MLS season well, and then I'll decide."
Difficult calendar
Messi also said: "This year we had a lot of matches, a lot of sequences of games. Luckily, I was able to play three in a row; it's day by day, feeling the sensations.
"It's clear that today was the last one with points at stake here, but day by day I try to feel good and, above all, be honest with myself. If I feel good, I enjoy it.
"If I feel bad, I'd rather not be here. A lot of things happened, being able to finish this way here was what I always dreamed of.
"Being able to celebrate with my people… for many years I received a lot of affection at Barcelona, and my dream was to also have it here, in my country, with my people. For many years, many things were said, but I'm left with all the good we did."