Lotto-Soudal rider Stig Broeckx has undergone surgery to relieve pressure within his skull following the head injuries he suffered at the Tour of Belgium.
Broeckx suffered two bleeds on the brain, in addition to a fractured eye socket and lung bruising, after being hurt in a collision involving two motorbikes last weekend.
The Belgian was taken by helicopter to a hospital in Aachen, although surgery was not initially deemed necessary.
However, a statement from Lotto-Soudal on Tuesday evening revealed two operations on Broeckx, who remains in a coma, had taken place.
It read: "Because of the increased intracranial pressure Stig Broeckx had to undergo two operations today, which stabilised the intracranial pressure again.
"Stig will need to stay in an induced coma for a while to let his body recover from the injuries and surgery. At the moment no prognosis can be made."
Another Belgian cyclist, Antoine Demoitie, died in March after a collision with a motorbike in the Gent-Wevelgem one-day race.