"United want him and we would be delighted to see Gabriel develop in such a club.
"We will make it official when the moment comes."
Obertan, who is 20 years old spent the second half of last season on loan at Lorient, is a regular in the France Under-21 side and scored against England U21 in March.
He was awarded the Most Valuable Player award at last month's Toulon International Youth Tournament.