Tottenham boss Harry Redknapp knows they face a stiff test against Sunderland.
Redknapp knows it will not be an easy fixture given that Sunderland have impressed lately under Martin O'Neill, who has dragged the Wearside club from the relegation zone to ninth since taking over in December.
"Martin has come in, and as Martin always does he has got them up and going straight away and has done a great job there," Redknapp said. "They are a difficult team to play against.
"He is full of enthusiasm still and it's good to see him back in management again. He is a great character and a top manager.
"They had a great result drawing at Manchester City last weekend and it will be a difficult game but we have to keep going."