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GLASGOW, SCOTLAND - SEPTEMBER 28: Manchester City manger Pep Guardiola with Mikael Lustig of Celtic during the UEFA Champions League match between Celtic FC and Manchester City FC at Celtic Park on September 28, 2016 in Glasgow, Scotland. (Photo by Mark Runnacles/Getty Images)

GLASGOW, SCOTLAND - SEPTEMBER 28: Manchester City manger Pep Guardiola with Mikael Lustig of Celtic during the UEFA Champions League match between Celtic FC and Manchester City FC at Celtic Park on September 28, 2016 in Glasgow, Scotland. (Photo by Mark Runnacles/Getty Images)