Stig Broeckx remains in a non-induced coma after suffering two bleeds on his brain in a collision involving two motorbikes during stage three of the Tour of Belgium on Saturday.
The Belgian was taken to hospital in Aachen in a helicopter after sustaining serious injuries in an accident involving around 20 riders.
Broeckx's team, Lotto Soudal, revealed on Sunday the 26-year-old's condition is being monitored on an hourly basis.
Team doctor Servaas Binge said: "Constant monitoring and tests showed that the intracranial pressure has slightly increased, but within acceptable limits.
"During the next 48 to 72 hours the increase or decrease of the intracranial pressure will be decisive for further treatment. If the intracranial pressure increases, surgery might be necessary.
"A decrease of the pressure would be a positive sign. The bleedings in the brain have stabilised.
"The condition of Stig needs to be monitored every hour and the neurosurgical team of the hospital is consulted for the treatment.
"The secondary injuries - fracture of the eye socket and bruised lung - don't have a determining influence at the moment."
The crash came only two months after fellow Belgian cyclist Antoine Demoitie was killed after a collision with a motorbike in the Gent-Wevelgem one-day race.