El-Hadji Diouf is confident that Sunderland have the quality to 'do something' in the Premier League this season.
The Black Cats finished 15th with 39 points in their first year back in the top flight but Roy Keane has been busy strengthening his squad during the summer.
Diouf, who arrived from Bolton last week for an undisclosed fee, expects Sunderland to improve considerably.
The Senegalese forward believes Sunderland are a stronger side than Bolton and feels they can become a major force in English football if they play in a positive manner.
"I was in the Premier League a long time with Bolton and I can tell you now - this team will do something next season," Diouf said in the Daily Express.
"We have a better team than the one I left at Bolton. There is a lot of talent here.
"I have already seen some very good signs from the side and we are playing some good football.
"I have said to the lads we need to be more aggressive and play more attacking football.
"We have to go at teams because we are a good side. We need to believe in ourselves more.
"We don't have to fear anyone."
Sunderland lost 1-0 to Ajax in their latest pre-season friendly at the weekend but Diouf was encouraged by the performance, insisting that his new team will be able to compete with the Premier League's finest.
He said: "Sometimes this team has had too much respect for the big teams such as Manchester United and Liverpool but this year we don't have anything to prove against them."