United were drawn against Besiktas, CSKA Moscow and Wolfsburg in Group B of the Champions League.
“These are difficult ties, especially the trips to Russia and Turkey,” Ferguson told United’s website.
“CSKA have developed strongly in the last few years and games in Turkey are always difficult.”
“We also know the quality that we’re up against with Wolfsburg, with what they achieved in the Bundesliga last season,” Ferguson added.
