Belgium international Axel Witsel has questioned whether Borussia Dortmund have the quality it takes to compete for the top spot in the Bundesliga.
The midfielder warned that the club's run of mediocre results has nothing to with a weak mentality, but rather deeper-rooted problems.
Vying for a first Bundesliga title since 2012 following investments of around €125 million during the summer transfer window, Dortmund have stalled in recent weeks. A 2-2 draw with Werder Bremen on Saturday saw BVB drop to eighth in the Bundesliga, three points behind leaders Bayern Munich.
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