Chelsea No2 Roberto di Matteo was delighted with the manner of their 4-0 FA Cup win over Portsmouth.

Juan Mata directed home a Florent Malouda cross to give Andre Villas-Boas' side the lead three minutes into the second half before the npower Championship club pushed for a leveller.

However, Chelsea secured progression to the fourth round as Ramires grabbed a late brace and Frank Lampard scored deep into stoppage time.

"I thought it was a very good all-round performance," Chelsea assistant manager Di Matteo said.

"Portsmouth made it very hard, especially in the first 45 minutes, and it is always difficult to break an opponent down and find a space with so many players.

"It was just a matter of scoring the first goal and we were always confident we were going to be able to do that.

"In the second half we got further forward and secured the win.

"I think it was a matter of finding the spaces and keeping possession.

"We knew the chances would come and that is exactly what happened in the second half."