Chelsea, who were 10 points clear of second-placed Tottenham in March, have lost two of their last four league games, including Sunday’s 2-0 defeat at Manchester United, to reduce their lead to four points with six league games remaining.
“It could be a big thing psychologically,” Kane told British media.
“Of course it’s a different competition so it’s hard to say, but it’s a big game for us... If we win next week, it might put a bit more doubt in their minds regarding the Premier League.”
Kane said Tottenham had had a superb season, but urged his teammates not to take their foot off the pedal.
“If you look at the table, 71 points with six games left is incredible. We’ve got to make sure we finish strongly – it isn’t over yet,” Kane said.
Tottenham’s last FA Cup win over