Martial is one of Seville’s support for the attacking line, after the Mexican winger Techatio Corona.
Seville is second in the Spanish league standings with 46 points, only four points behind leaders Real Madrid.
And Sky Sports revealed that the Spanish club will guarantee the value of the French player’s salary until the end of the current season.
The 26-year-old moved to Manchester United from Monaco in 2015 for 80 million euros at the time.
Martial participated with United in 269 matches, during which he scored 79 goals and assisted 50 others.
During the current season, Martial only participated in 11 games with United in all competitions, during which he scored one goal.
Martial won the League Cup, the League Cup, the Charity Shield and the European League with the English club.