Tottenham have already sought out Zaha several times, initially in the summer of 2016 for a £12 million offer which was ridiculed by Palace chairman Steve Parish. Spurs then followed it up with another rejected offer of £21million.
Zaha's contract is not due to expire until 2022 and the winger is on a weekly salary of £100,000. It is speculated that Tottenham will offer £40million this summer to poach the 25-year-old.
Palace are desperate to hold onto the player, especially given that they have lost every league game they have played without Zaha. His comeback from a knee injury coincided with Palace's move out of the relegation zone, in his first start since 4th February.
Having been a long-term target for Spurs, they will be hoping that their bid will secure the summer transfer, although Palace will likely argue that Zaha is worth far more to them than Tottenham's offer.