While happy with the result against Sweden, the Bayern defender knows his team have to improve after picking up their first points in Russia
Mats Hummels believes Toni Kroos' stoppage-time winner against Sweden can kick-start Germany's World Cup campaign, though he recognises the champions have plenty of room for improvement.
Germany emerged from the jaws of elimination to the cusp of the knockout phase thanks to Kroos, whose 95th-minute free-kick lifted Joachim Low's 10-man side to a last-gasp 2-1 victory in Sochi on Saturday.
The holders, who had Jerome Boateng sent off late for a second yellow card, dominated in attack but were vulnerable in defence throughout the Group F showdown at Fisht Stadium.