After tonight's clash with Marseille, United face an intense period of games that continues with Premier League trips to Wigan, Liverpool and Chelsea, before United must face either Arsenal or Leyton Orient in the FA Cup sixth round.
"We have an important few weeks coming, there is no question about that," said Ferguson.
"We are just starting four away games on the run, which is a great challenge for us.
"They are all fantastic matches but it is a time we should enjoy. They are big games and in that situation, the players don't let us down often."