Tottenham midfielder Dele Alli says they must not underestimate FA Cup opponents Rochdale.

The League One side have invested £500,000 in a new surface ahead of Sunday's tie which will be broadcast live on television.

And Alli says that Spurs are aware of the challenge which lies ahead.

"We've just got to go there and be professional," he said. "It's going to be a tough game and we have to make sure we're ready for it.

"We saw that against Newport (in the previous round), it was a difficult game and we had to play them at our place and get the win there."