Watch Bristol Rovers vs Charlton Athletic Live Streaming
Watch Bristol Rovers vs Charlton Athletic Live StreamingTactically, Leonardo's side have been forced to adapt since Kaka's move to Spain, according to Ferguson.
He added: "They have changed since they lost Kaka.
"They used Kaka at the head of a diamond and two front players but they have changed that and gone 4-3-3 with two wide players and three centre-midfield players.
"You have to recognise they are not short of skill and experience.
"Ronaldinho, Pato all these players, but equally we have players who can win the match too.
"After the experience in the San Siro three years ago, where they dominated the game, I know that won't happen again."
Pato is outlined by Ferguson as the biggest threat to United in the first-leg contest, which may see David Beckham face his former club.
"It's Pato they are desperate to get back in," added Ferguson.
"If he's not back they'll play David wide right.
"We know all about David, he's a great crosser of the ball so we will have to be alive to that."
