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Barcelona coach Hansi Flick warned that football can change quickly after his side came from behind to beat Galatasaray 4-1 in the Champions League on Tuesday, extending their winning streak to 10 matches to start the season.
Aleksey Batrakov gave the home side a surprise lead in Istanbul but João Cancelo levelled before the break and second half goals from Fermín López, Anthony Gordon and Karim Adeyemi sealed the victory for the Spanish champions.