The 34-year-old was last week ruled out the 5-28 May Giro d’Italia after doctors ordered him to take two weeks of total rest before returning to training.
The Tour of Flanders and Amstel Gold Race champion was forced to miss both the Flèche Wallonne and Liège–Bastogne–Liège Ardennes classics.
His Quick-Step Floors team said he’d “received good news from the doctors, who gave him the green light to start training again.”
He is due to race in two events on Saturday and Sunday. The first is retired team-mate Tom Boonen’s farewell race in Zilvermeer then his own Philippe Gilbert Classic in Aywaille on Sunday.
The team statement did not say if Gilbert would still miss the Giro but noted a revised racing schedule would be released shortly.