Two of the nine construction workers injured in Sunday's early morning collision between a BMW driver and a lorry are in intensive care, their employer said on Monday.

One of them, a worker from China in his 30s who was flung out of the lorry and into a canal nearby, sustained a skull fracture and internal bleeding. He was in stable condition at National University Hospital (NUH) after an operation on Monday but will undergo a second one on Tuesday, said project manager William Neo of Hon Industries, the construction company the workers work.

Another of those injured is also warded in the intensive care unit at Alexandra Hospital (AH) after sustaining a blood clot in his brain. Four other workers remain hospitalised - two at NUH and two at AH.

On Sunday, a driver in his 20s who was suspected of drink-driving was arrested following the crash that left the pick-up carrying workers lying on its side.