British Horseracing Authority chief executive Paul Bittar is hopeful jockey Frankie Dettori can be given the go-ahead to return to action before next weekend's Epsom Derby meeting.
French racing authority France Galop banned Dettori, 42, for six months after he tested positive for cocaine at Longchamp last September, with his suspension reciprocated by the BHA.
The Italian had this week been due to make his comeback, but Dettori remains exiled from the sport after a test carried out by France Galop produced, according to Bittar, an "irregularity".
The BHA chief is expectant the jockey's return to the saddle will now be hastened after he spent the last few days in France in an attempt to address the issue.
He told The Morning Line: "I know him and his team have spent quite a lot of time with France Galop over the last few days.
"As soon as he has satisfied all of their requirements we are in a position to move very quickly.
"I know they (France Galop) are very hopeful he will satisfy all of their requirements in the next few days.
"If they can, we are in a position to green light him very quickly.
"The information in the public domain is all the information that France Galop have given us - just that there was an irregularity and they sought to discuss the issue with him."