The young winger scored eight goals and registered the same number of assists in all competitions last season and popped up on the radar of several big clubs.

Leverkusen sold Kai Havertz in the summer for a fee of around €80m and could have raked in more money for Diaby if they wanted to sell him.

According to German magazine Sport Bild, Manchester United expressed an interested in taking the winger to Old Trafford.