Chelsea midfielder Michael Ballack has picked up an injury on international duty with Germany.
Ballack is doubtful for Wednesday's final World Cup qualifier against Finland after sustaining an ankle injury in Russia last night.
The 33-year-old Chelsea midfielder picked up the knock in the first half but played on for 90 minutes to help Joachim Low's side clinch a 1-0 win at the Luzhniki Stadium to secure their place in South Africa next year.
Ballack will see a doctor in his homeland to assess the extent of the damage.
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