The Canaries are seven points clear of the relegation zone, but Spurs boss Redknapp has warned that they could easily slip in to the bottom three if they have a poor second half.
"Norwich have done fantastic. They have done really well," Redknapp said.
"Them and Swansea have come up and are both playing very well.
"But I'm sure they know that there have been lots of clubs come up and play very well first half of the season and they know they've got to continue that second half, for sure.
"It's going to be tight at the bottom."