Gunners facing tough road to final 16 after loss to Dortmund

Arsene Wenger admits Arsenal's 2-1 loss to Borussia Dortmund has left his team's bid to qualify for the Champions League knockout stages on the razor's edge.

Wenger's team lost its 100 percent record in Group F as Robert Lewandowski's late winner stunned the Gunners and ended their 12-match unbeaten run in all competitions.