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When Gylfi Sigurdsson was on loan at Swansea City, his class was evident with braces against Wigan Athletic and Fulham.
Even at Hoffenheim, he had a standout game against Hannover 96 with two goals in the span of three minutes whilst playing alongside Demba Ba, who would later become a Chelsea player, and Luiz Gustavo, on his way to becoming one of the best midfield destroyers in the game.
Sigurdsson's two goals against Norwich City reminded everyone that he isn't a squad player.
Starting as an left attacking midfielder, with Christian Eriksen the No. 10 and Andros Townsend on the opposite flank, Sigurdsson exploited Norwich's inability to track runners, enabling him to get in front of goals twice. He punished the Canaries on both occasions.