Manchester City boss Pep Guardiola is refusing to be downbeat - despite suffering a third consecutive loss.
Their latest was a heavy 4-1 defeat away to Sporting in the Champions League.
Guardiola insists they will face the challenging period head on.
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Celtic are back to winning ways in the competition, beating RB Leipzig 3-1 at Parkhead.
Elsewhere, defending champions Real Madrid suffered a second defeat of their campaign, losing 3-1 at home to AC Milan.
