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ST PETERSBURG, RUSSIA FEBRUARY 22, 2018: Zenit St Petersburg's Branislav Ivanovic gestures in Leg 2 of their 2017/18 UEFA Europa League Round of 32 football match against Celtic F.C. at Saint Petersburg Stadium. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)

ST PETERSBURG, RUSSIA  FEBRUARY 22, 2018: Zenit St Petersburg's Branislav Ivanovic gestures in Leg 2 of their 2017/18 UEFA Europa League Round of 32 football match against Celtic F.C. at Saint Petersburg Stadium. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)