The rally world has been shocked by the death of Hyundai driver Breen, who died in a testing crash last week in preparation for the asphalt event.
The fourth round of the world championship has continued albeit in a subdued and sombre manner with all drivers and teams paying tribute to the 33-year-old Irishman.
After careful consideration, which included discussions with Breen's family, surviving co-driver Fulton, and Hyundai Motorsport's crews and team members, the team decided to compete in Croatia but with a reduced two-car line-up driven by full-time drivers Thierry Neuville and Esapekka Lappi.
The cars are carrying a special tribute livery this weekend.
Drivers are both united in their grief but are determined to put on a show to honour Breen.
"Myself, I'm doing not so bad. It's difficult, it's demanding and it's so hard for all of us," said M-Sport's Ott Tanak after Thursday's shakedown.
"It's empty inside and it's eating us alive. It's tough, but I promised to give a smile to Jackie (Craig Breen's mother). We keep going."
Neuville has called for the rally community to stay strong and to compete in the passionate manner Breen displayed during his career.
"We are all very sorry for what happened. It's going to be a tough rally for everybody but as a team and as a rally family we need to be strong and keep going. That is what Craig would have wanted," said Neuville after the shakedown.
He added: "I have many great memories but I think we will remember Craig as somebody who lived his dream 110%, who achieved his goal in life by getting into the WRC and driving the fastest cars in the world.
Source: Autosport