Paris Saint-Germain midfielder has revealed a part of the team's secret diet which gives them a pre-match boost to improve their performances.
The former Manchester United player has revealed that players at the French club are given a beetroot smoothie before games.
It's said the drink is 'scientifically proven' to improve performance.
The drink seems to be doing the trick for the Parisians this season, as they sit top of the Ligue 1 table - 13 points ahead of Marseille having lost just one game.
Herrera though has revealed that the drink can cause a disturbing surprise and a bit of a fright after the first time they have it.