In an injury interrupted season, Karaman bagged six goals in the German league.
The potential of a cut-price deal for the Turkey international has alerted a number of clubs.
Karaman is one of the forwards under consideration by Monchi at Sevilla, a list also containing Roma target Nahuel Bustos.
Another top flight Spanish club, Getafe, also have Karaman in their sights.
However, according to Estadio Deportivo, Germany-born Karaman would prefer to make the jump to La Liga.
Many clubs will be looking for bargains this summer with the current economic crisis, and Karaman for €1m could be one of them.