Mats Hummels says the Borussia Dortmund players are sometimes too quiet on the pitch and “have to be woken up a bit” in order to perform during games.
Dortmund are currently third in Bundesliga, five points behind leaders Borussia Monchengladbach after struggling for inconsistency so far this campaign.
A run of two wins in eight league matches during the autumn, including a 3-3 draw at home to bottom side Paderborn, put head coach Lucien Favre’s position under scrutiny.
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Successive wins over Hertha Berlin and Fortuna Dusseldorf have eased the pressure on Favre, but Hummels concedes there is room for improvement.