You can verify the status of a .eu domain by performing a .eu whois search
If your .eu domain shows as Quarantine Status then your domain can not be renewed in the normal way.
The process of taking a .eu domain out of quarantine is as follows:
If a domain name is not renewed by its expiry date, it is not immediately released, but is held in quarantine for 40 days. The Quarantine Period ends on the date shown in the .eu Whois (see above) at in the “Available” field.
During the 40 day Quarantine period, the domain can be retrieved (reactivated) by the owner; however, the cost to reactivate a domain that is in quarantine is higher than the standard renewal rate. After the 40 day quarantine period, if the domain has not been reactivated, it is made available to the public.
When you reactivate a domain that has been in quarantine, the new expiry date is one year from the original expiry date.
The price for removing a domain from Quarantine is as follows:
£9.49 per domain year (standard registration fee)
£30.00 Quarantine release fee
If you would like to release the domain from Quarantine please email firstname.lastname@example.org & we will create an invoice for you.
If you do not want to take the domain out of Quarantine, the only remaining option is to try to re-register when it released. The domain is released back to the public on the “Available” date shown in the .eu Whois (see above).
You need to be aware that domains are registered on a first come, first served basis and there is no guarantee that you will be able to re-register the name when it is available.