Demirovic has spent an impressive season on loan at St. Gallen in the Swiss Super League, scoring 11 and assisting five goals in 21 games.
St. Gallen manager Peter Ziedler confirmed interest from ASSE and unnamed German sides in May.
“He still belongs to Alavés,” Ziedler told L’Est Republican. “He is sought by many clubs in the Bundesliga… and Saint-Etienne, among others, in France.”
According to BILD, those clubs are Freiburg and Hoffenheim.
Demirovic is German born and was in the RB Leipzig youth system before heading to Spain.
He has one year remaining on his contract with Alavés, who would want a €5m transfer fee.