Kane has been the subject of negative headlines and memes since claiming Spurs' second goal at Stoke on April 7, taking it away from team-mate Chrisitan Eriksen.
However Alli had his compatriot's back and believes he must blank out the negativity to catch Mohamed Salah in the race for the Premier League Golden Boot.
The midfielder said: "Harry is an unbelievable striker. To be honest he touched it so it's his goal and every striker would and should claim it if it is their goal.
"He has just got to ignore what everyone else is saying, he knows how good he is and I am sure everyone else knows how good he is.
Alli continued: "Everyone is different, I don't know how H is going to take it, but I think it gives some people a chance to put him down.
"But playing with him every day in training I can see how hard he works, he wants goals, he's a striker, every striker wants goals, so he has just got to ignore it and focus on himself which I am sure he will do.
"He is an unbelievable player and he is a great person as well. If it was me and I touched the ball I would try and claim it as well."