Thanks for your help !
My initial VC configuration was :
fpc0: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 1/1 Configured Absent 1/0 Configured Absent
I've deleted the two ports from the VC :
request virtual-chassis vc-port delete pic-slot 1 port 0 request virtual-chassis vc-port delete pic-slot 1 port 1
Then the two ports are no longer listed on VC ports :
show virtual-chassis vc-port all-members fpc0: --------------------------------------------------------------------------
I will try to plug in tranceivers an check if the et-0/1/0 and et-0/1/1 appears on "show interfaces terse".
Regards,