Dele Alli has admitted he's struggled to emulate his form of the past two seasons.

The Tottenham star has endured an underwhelming campaign so far, but his last two games, in which he has provided four assists and scored one goal, may indicate that brighter times lay ahead.

21-year-old Alli, who is expected to become a client of famed super-agent Jorge Mendes at the end of season, says it's great to prove the doubters wrong but he insists he's his own strictest critic.

"My form is not really something I think about too much, but it's always nice to prove people wrong," Alli told the Daily Mail.

"At 21 years of age, when you set your standards as high as I did in the last two years, it's not always the case that you're going to be able to reach them all the time.

"Some people think if you're not scoring or assisting then you're playing badly, but I criticise myself all the time. I always think I can do better, I can do more for the team, so it's just about working on myself and my own game.

"People's opinions are changing all the time and you'd be more worried if the other fans liked you as a player. When your own fans start disliking you then it changes, and you think about it a bit more."