Wilfried Zaha
Zaha returned to his best against Middlesbrough as he made one goal and scored another Getty Images

Crystal Palace manager Alan Pardew has warned Tottenham Hotspur they require an offer approaching £50m in order to sign winger Wilfried Zaha. The north London club failed to lure the England international during the summer transfer window and are hopeful of seeing off any future interest in their prized asset.

Sky Sports understand Spurs made a £15m bid for the 23-year-old last month, only to end their interest after the offer was rejected. The club quickly turned their attention to France international Moussa Sissoko, signed on deadline day from Newcastle United for £30m according to BBC Sport.

But in an effort to ensure Tottenham do not return in the next transfer window to sign Zaha, Pardew says only a massive bid would be enough to prise him away from Selhurst Park. The former Manchester United man has begun repaying Palace's faith with a goal and an assist in the Premier League win at Middlesbrough and the Eagles boss has been impressed by his attitude.

"Of course I sat down and spoke to him. I want someone to blow the doors off if they're going to come for him, not have him go somewhere as a squad player at £16-17m," Pardew said, according to Sky Sports. "When you see someone put £50m that's when you think about it. That assist for the first goal [against Middlesbrough] - I can't ask for more.

"Trust me, I've been in the position when you can't get anything out of a player," he added. "Us Premier League managers pull our hair out. That's not been the case with Wilf. If I was to mark him out of ten I would give him a ten, that's how good his attitude's been."

The fresh valuation would require Tottenham to smash their transfer record, currently held by Argentine Erik Lamela who moved from Roma for £30m in the summer of 2013, according to BBC Sport. The addition of Sissoko is expected to curtail Mauricio Pochettino's desire for a winger though the attraction of the player not being cup-tied for the Champions League makes a January move still feasible.

Tottenham have already come up against Zaha once this season, but the Ivory Coast-born player was unable to make an impression at White Hart Lane. Victor Wanyama scored his first goal since moving from Southampton as Spurs prevailed 1-0.