Paolo Maldini has earmarked Wayne Rooney as the man standing between the Rossoneri and a place in the Champions League quarter finals.
The 36-year-old defender coped admirably with United’s precocious youngster as the Italians left Old Trafford with a 1-0 advantage, but he expects a renewed challenge in next week’s second leg.
"We knew it was important to prevent United from scoring and that meant we had to keep a close eye on Rooney," Maldini told Uefa.com.
"He's a fantastic young player with a lot of energy and movement, so you have to watch him at all times. He will be dangerous in the second game along with Van Nistelrooy who will be a bit sharper after his injury.
"We can't just sit back and try to defend a 1-0 advantage.
"We will play the same kind of game we played at Old Trafford and that means we will attack and try to get the goals to take us through."
And for Maldini, a four-times Champions League winner with 126 caps to his name, last week’s clash brought back some special memories.
"When we arrived at the stadium one of the first things the players did was to go to the dressing rooms and seek out the places where we changed for the final [in 2003]," he said.
"Of course, it would be fantastic to win the Champions League for the fifth time as a player, but first we have to take care of United and then we will see.”