Defoe said: "Sunday is another massive league game and the manager will look for the same performance.
"Top teams can turn it on - even when they've had a little blip and are not playing well.
"But we have come a long way at Spurs. Last year, we sort of set a benchmark, beating the top teams and we've done it again.
"It's always important to have a winning mentality. Top sides have it - and we've definitely got it now, too."