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Bayern winger Serge Gnabry opened the scoring in the 14th minute against Holstein Kiel at the Holstein-Stadion on Wednesday.
However, Holstein stunned the defending Bundesliga champions before half-time after they pulled back an equaliser through Fin Bartels.
Sane stepped up for a free-kick early into the second half and showed exactly what he is capable of with a stunning strike.
The 25-year-old former Manchester City winger's curling effort easily cleared the wall before smashing into the back of the net past a helpless Ioannis Gelios.
Sane's free-kick all but seemed to have sealed the win for Bayern before Hauke Wahl scored an equaliser for Holstein deep into injury time.
However, Bayern legend Lothar Matthaus has criticised the Germany international for his form and defensive mindset, saying it might be the reason why he isn't a regular starter for his side.
The 59-year-old German told T-Online: "A regular would mean he has to get past Kingsley Coman and Serge Gnabry. The hurdle is high. Sane was injured for a long time.
"He has to get used to FC Bayern's system, to the high and aggressive pressing. He has deficits on the defensive side anyway. He has to work on that."
Matthaus added: "That's probably why he [Pep Guardiola] let him go, because Sane doesn't work backwards as he imagines.
"Unlike Serge Gnabry or Kingsley Coman, who had internalised the backward movement, Sane still has to learn."
Featured Image Credit: ESPN/Twitter
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