The French champions are looking to get over the disappointment of losing the Champions League final last season by going all the way this season.
But in the semi-finals, they will be facing one of the favourites for the tournament in Manchester City, with the first leg set to take place at the Parc des Princes on Wednesday night.
Herrera encountered Guardiola when he was in Spain and England, and insisted that the Manchester City coach is not as fixated about his ideals as everyone makes it out to be.
He stressed that while there are some basic tenets of the game that a Guardiola team will always stick to, the Spaniard is more than happy to adapt his style to suit the players he has at his disposal.
When asked if Guardiola has adapted his style to suit the Premier League, Herrera told Spanish daily Marca: “He has not lost his essence, but he also adapts to the players he has.
“He is smart and things are not black or white for him. He still likes to have the ball, he used the false nine like he already did at Barcelona with [Lionel] Messi or Cesc [Fabregas].
“His team attacks the entire game and seeks to subdue the opponent by keeping the ball.”
Guardiola has not reached the Champions League final since winning it with Barcelona for a second time in 2011.