Sebastien Loeb will test Citroen’s 2017 World Rally Car on gravel for the first time on Wednesday.
The nine-time WRC champion returned to Citroen last month to try its C3 WRC on asphalt.
Now he will spend a day on gravel close to Barcelona as part of Citroen’s pre-Rally of Spain testing.
Citroen team principal Yves Matton said he was looking forward to Loeb’s feedback.
“It was useful to take his feelings from the test on Tarmac and it will be the same when he drives on the gravel,” said Matton.
Autosport understands the potential for Loeb to return to Citroen for a limited programme of WRC rounds next season depends largely on the result of the Spanish test.
Loeb won all nine of his WRC titles with Citroen before being dropped at the end of 2015, when he was no longer required for its World Touring Car Championship assault.