In part, that is because Zaha could be reluctant to move north again after his failed stint at Manchester United following his move there in 2013.
Zaha has rejected a new contract in a bid to force a move. His improvement over the last three seasons has been so astounding that he is now considered to be among the best attacking players in the Premier League.
Set to celebrate a move to Chelsea? While Hazard is expected to stay put, the Brazilian winger still faces an uncertain future, with Manchester United keen on signing him.
Blues boss Maurizio Sarri is now facing an attacking headache with Brazilian global Willian set for a big money move to Manchester United or Barcelona, and Eden Hazard looking to force a move to Real Madrid. Zaha is thus, a viable target, who will bolster the Blues' attack irrespective of the Brazilian's departure.
China threatens tariffs on $60 billion in USA goods
Concerns about the trade war have already affected China's currency, which has fallen nearly 9% against the dollar since April. The move has prompted concerns of a global trade war as each nation has responded with retaliatory tariffs on US products.
Palace's offer was believed to be around £120,000-a-week, an upgrade on the £100,000-a-week contract the 25-year old forward signed just 15 months ago.
Tottenham have long held an interest in the talented winger, while Chelsea have also emerged as a potential destination for the player.
The race to sign Zaha is getting increasingly unpredictable.
Ivory Coast worldwide Zaha impressed with nine goals and made five assists in 29 games in the Premier League last season to earn rave reviews for his performances.
He could even consider lodging an official transfer request after Palace told him they would only consider an irresistibly huge offer.