Barcelona midfielder Xavi believes there's much to improve within the team.
Barca are unbeaten this season with 14 wins from their 18 competitive matches.
"I understand that there is criticism because we aren't at the level we were a few years ago, but the style hasn't changed at all - winning the ball back in your opponents' half and then attacking quickly is not playing on the counter-attack," the Spain international told reporters.
"But it's difficult, it depends on circumstances and what a game requires, but we aren't changing our system, absolutely not.
"The team's philosophy is untouchable and non-negotiable. That was Tata's (Martino) message to us on his first day."
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