London: Sunderland manager Dick Advocaat says he needs more reinforcements to fix the Black Cats` leaky defence which has conceded 11 goals in four games this campaign.
Sunderland, who added three defenders this summer, let in three goals against League Two side Exeter City in the League cup on Tuesday before Jermain Defoe`s hat-trick secured their 6-3 win.
"I`m happy with the six goals, but totally unhappy with the way we gave three goals away. That has to improve and the players know that," the 67-year-old Dutchman was quoted as saying by the Sunderland Echo.
"I am wondering if it is to do with concentration, sharpness -- it cost us three goals, and that`s a worry. And it`s not the first time," the former Netherlands manager added.
The Black Cats have been heavily linked with Man City`s Belgian international defender Jason Denayer, but Advocaat played down the move.
"There has been talk about the young guy from Manchester City, but he is going to another club," said Advocaat.
"We are still looking, but when (Younes) Kaboul is fit, he`s a very good player."