Vidal, 33, is one of several high-profile players set to be sold ahead of the new season while the future of captain Lionel Messi is in doubt after he handed in a transfer request.
The tumultuous behind the scenes ongoings and questionable transfer policy culminated into the humiliating 8-2 defeat in the UEFA Champions League at the hands of Bayern Munich that Gerard Pique described as hitting 'rock bottom'.
And with a restructuring set to take place, Vidal has pinpointed the major issues that exposed the Blaugrana during their rare trophyless campaign.
"Barcelona first have to change their way of thinking because football has evolved a lot, their DNA is already lagging behind and other teams are improving in other aspects," Vidal told La Tercera.
"Football at the moment is more physical, with more strength and speed and technique sometimes takes a back seat."
Vidal continued: "Barcelona has to change a lot of things. A team, which I think is the best in the world, cannot have 13 professional players and the rest are youngsters.
"Not because they do not deserve to be there, but they have to be competing with the best and who has to play.
"All teams have 23 players fighting for positions, growing and improving every day; But when they do not progress when you think that with your DNA you can always win, you are very wrong.
"There are very good players, we have Messi who is number one and is an alien, but he needs help, he needs players who improve the team and give better results."