The 32-year-old Argentinean last won the trophy in the 2014-15 season and has since then seen his Barcelona side being knocked out of the competition in unbelievable fashion on multiple occasions.
He also went ahead and named Juventus, Paris Saint-Germain and Madrid as the other sides that could challenge for the Champions League this season.
"All [the teams] are complicated and difficult," he told Spanish newspaper Mundo Deportivo.
Barcelona ❌— SPORTbible (@sportbible) February 21, 2020
Lionel Messi has named the four teams he thinks have the best chance to win the Champions League 👀https://t.co/MhieEpSMj8
He continued, "Paris went to play Dortmund and lost, Liverpool went to Atletico's field and lost, but I think, like that and everything, Liverpool, Juventus, Paris and Madrid are the strongest today."
Messi then went on to speak a bit more about Atletico's win against Liverpool as he said, "On the day of the draw, we talked in the locker room that would be very close because Atletico competes a lot in this competition. In two-match duels they are very strong and they showed it again, that they will compete and they will be there."
Speaking about what needs to be done for an improved performance by Barcelona in the Champions League this season and why they are not favourites, Messi concluded, "It's true that in the Champions League we have to keep growing, and a lot too, because the way we are right now I don't think it's enough to win the Champions League. We have to be more consistent in our play, take on board all the new things that we're doing [with manager Quique Setien] and put them into practice as soon as possible, be more reliable, not make so many stupid mistakes..."
Messi's Barcelona will return to their Champions League campaign next Tuesday with an away trip to Napoli.