Saudi Arabia has scaled back lofty ambitions for its NEOM gigaproject to prioritize completing elements essential to hosting global sporting events over the next decade as rising costs weigh, three sources told Reuters a day after the sudden departure of the project's longtime CEO.

Saudi Arabia's Neom construction would require 20 percent of the world’s steel supply, an unprecedented amount of steel for one construction.

Saudi Arabia replaced the executive that was overseeing its plan to build the $1.5 trillion futuristic development known as Neom, in the latest sign that the project is struggling to deliver on its ambitions.

The departure of the longtime CEO marks a major shakeup at Neom, which is a showpiece of Riyadh’s economic ambitions.