Two more riders have tested positive for Covid-19 at the Tour de France, the International Cycling Union (UCI) announced on Monday.
All riders underwent a test on Sunday evening after the 15th stage and on the eve of Monday's rest day.
"The two concerned riders do not rank within the top 20 of the event's general classification," the UCI said in a statement.
"While these riders are completely asymptomatic, security measures (isolation of the two riders) have been implemented to protect the other participants.
"A final decision on their participation in the remainder of the event will be taken by tomorrow (Tuesday) morning in a collegial manner by the concerned parties (Covid-19 event and team doctors, and the UCI Medical Director)," the statement added.
Eight riders have had to leave the Tour since the start due to coronavirus.
Dane Magnus Cort Nielsen (EF Education) and Australian Simon Clarke (Israel PT) returned home on Sunday, after New Zealander George Bennett and Norwegian Vegard Stake Laengen (UAE), Australian Luke Durbridge (BikeExchange) and French riders Geoffrey Bouchard (AG2R Citron), Guillaume Martin (Cofidis) and Warren Barguil (Arkea-Samsic).
During the first rest day before the Alps on 11 July, all the tests had been negative.