The summer recruit also says the additions to the squad have made them a good team.
The former captain has also backed the potential signing of Aston Villa's Christian Benteke.
Sunderland have signed four players this summer, but Advocaat is hoping for more.
Nottingham Forest manager Dougie Freedman has confirmed there will be more new faces at the football club.
Rangers manager Mark Warburton wants to see a key factor installed throughout the club's dressing room.
Former Aston Villa striker Nathan Delfouneso is on the look out for a new club.
The Blues may make a move for the Brazilian as he only has a year left on his current deal.
The 24-year-old midfielder is yet to make the switch to Paris from Tottenham, but a deal is expected to be concluded on Monday afternoon.
Arsenal attacker Theo Walcott feels the club must keep the current squad together in order to move forward.
Aston Villa manager Tim Sherwood is hopeful Gabby Agbonlahor can improve on his goal tally from last season.
Zlatan Ibrahimovic may grab all the headlines, but there are other threats in the Paris Saint-Germain side. Here are three to watch out for.
Former Swansea boss Michael Laudrup is amongst the coaches in the frame to replace Walter Mazzarri at Inter according to reports.
Atletico Madrid goalkeeper Thibaut Courtois is to be recognised in the museum of Athletic Bilbao.