'El Jefecito' (the little boss) lays down a few home truths about the team who are favourites to become the first to win the tournament in successive seasons.
"Those on the inside don't have to adapt to those coming from the outside. No, no, no," he says. "It's those arriving to the club from the outside who have to adapt to those already here. The players who have come up through the system are the ones who pass on the culture of the club."
"Great players are very good technically but they also have a huge amount of character, because without it you will never get to see that great technique because it vanishes under pressure. I have had so many team-mates who have been technically better than me. But they have lacked that desire and mental strength. This team has that."
None of which means Mascherano does not marvel at Messi along with the rest of us.
"Football is not as easy as it looks from the television gantry," he says, before adding: "but for Messi it is".
"He is someone you never stop being surprised by. Iniesta is the same. There is always a piece of skill during a match or a training session. . . I have seen Iniesta dribble on the edge of our area so many times and you say to yourself: 'how has he done that?' If he loses the ball then they score. But he doesn't lose it."