MANCHESTER, England (Reuters) - While Pep Guardiola has become accustomed to the eye-popping feats of his goal-scoring machine Erling Haaland, the Manchester City manager marvelled at Wednesday's stupendous strike, playfully suggesting that Haaland is not human.

The 24-year-old Norwegian scored twice as City thrashed Sparta Prague 5-0 in the Champions League, but it was his first goal -- a flying back-heeled volley out of the air -- that had social media in a frenzy and left his teammates in awe.