Chelsea boss Roberto di Matteo believes they can take advantage of Manchester United's leaky defence tomorrow.

United have been even more suspect at the back this season, leading many to predict a goal-fest on Sunday.

"They are conceding a few goals and we have a big threat as well with our players, so we will try to exploit those weaknesses," said Di Matteo, who admitted Robin van Persie - who scored a hat-trick for Arsenal at Stamford Bridge last season - had made United more of a threat.

"He's scored some vital goals already.

"They're a strong team and they were at the top last season and have added to it.

"You wouldn't expect them to be anywhere else."

Both sides will be missing key players, with Chelsea without suspended captain John Terry and injured vice-captain Frank Lampard, who Di Matteo admitted was a "big loss".