Tour de Romandie and Tour of the Basque Country have been cancelled due to the coronavirus pandemic.
Run over a week in late April and early May, the Tour de Romandie takes in the Swiss Alps and is seen as a key warm-up to the Giro d’Italia.
Organisers said the Swiss cantons where the race passes through “are considered risk zones by the World Health Organization”.
Last season’s race was won by Primoz Roglic, who then came close to winning the Giro and went on to take the Vuelta a Espana.
The Tour of the Basque Country, due to run from April 6-11 in Spain, was postponed to an unspecified date “in compliance with orders from local authorities”, organisers said in a statement.
They said they had contacted the UCI in order to try and move the race to a later date.
Cycling has been hit hard by the coronavirus outbreak with the abandonment of the UAE Tour late last month after two Italian mechanics tested positive.
There was a sense of shock when the caravan of riders, support staff and media were put under quarantine, where some, including Colombian sprinter Fernando Gaviria, remain.
Then came the cancellation of Italy’s coast-to-coast Tirreno-Adriatico, with the nation’s key one-day Milan-San Remo race also being called off for only the fourth time in over a century.
Last Friday the Giro d’Italia was postponed after Hungary announced it would not host the opening three stages in and around Budapest as planned.
With around 100 days to go before the start there are still hopes the Tour de France will begin on June 27.