The Brazilian midfielder has high hopes that Real Madrid can make it to the quarter-finals, but has warned his team-mates to keep a close eye on the Manchester United attack
The Spanish champions were held to a 1-1 draw in the first leg at the Santiago Bernabeu, but Kaka is confident that Madrid have what it takes to wrap up the tie at Old Trafford.
"United have a traditionally European squad that always goes far in the competitions they play in. They also have some amazing individual players like Rooney and Van Persie," Kaka told Bwin.com.
"Manchester are really strong but we’re going to Old Trafford with confidence. The stadium is fantastic, with the atmosphere and the fans.
"We came off the first leg in the Bernabeu with the feeling that we could have won the game and that we can decide the draw in England and win the playoff."
Tuesday's encounter in Manchester is scheduled to kick off at 19:45GMT.