Former Germany international Gunter Netzer believes that the challenge of beating Arsenal represents a "real test" for Bayern Munich in the Champions League this season.

The reigning European champions travel to London on Wednesday for the first leg of their last-16 clash at the Emirates Stadium having already won in England this term, beating Manchester City 3-1 in the group stage.

Pep Guardiola's men boast a 16-point cushion at the top of the Bundesliga table, and Netzer claims that the upcoming tie with the Gunners will serve to help the Bavarian giants "sharpen" their tools in the defence of their European crown.

"The last-16 tie against Arsenal is a real test for Bayern," the 69-year-old wrote in his column for Bild am Sonntag.

"Now more is required than they have shown in their stroll through the Bundesliga. This must therefore be the greatest challenge for Bayern, the senses must sharpen for a competition in which they take on high-quality opponents.

"The games against Arsenal will give first clues as to where exactly Bayern are on a continental level. The 3-1 win at Manchester City in the group stages was the best performance in Europe under Pep Guardiola. Now is the time to substantiate that."

Wednesday's encounter in North London is scheduled to kick off at 7.45pm.