Germany captain Michael Ballack is doubtful for Wednesday's final 2010 FIFA World Cup South Africa™ 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 and secure their place in South Africa next summer.

Ballack will see a doctor in Germany today to assess the extent of the damage.