Tottenham defender Ben Davies is shocked by West Ham United's success this season.
The Hammers sit eighth in the table, just five points behind Spurs in the race for the top four.
Davies said: "I think they've surprised everybody really, they've done well this year.
"We're both up and around there this year and fighting for similar spots in the league so of course they're definitely our rivals and a win for us will really push us another step above them.
"They're making games hard for teams, which is going to be a tough one for us on Sunday and one we're totally aware of, and we've got to go in there and put in another good performance to get a win.
"The boys are always making you aware of how big these games are so we're aware of what's at stake and we're going to do everything we can to get the win."
