The nature of that defeat caused some to question Guardiola's tactics, but Lahm has defended his coach's philosophy.
"This discussion is unnecessary," he told Perform . "In the 17 games before, plus the previous season, everyone hailed our style of play.
"We conceded four goals in the first leg [first 17 league games] of the season. This system is risky when not all of the players do what they are supposed to do.
"If more players do not fulfil their positions, then it looks like against Wolfsburg [when Bayern lost 4-1].
"Then we get problems. If it works - and it worked for over a year and a half very well - this system is top."
