SC Freiburg are keeping tabs on Caglar Soyuncu's situation at Leicester City.
The Turkey international was sold by Freiburg to the Foxes for €21m two years ago and it's now emerged the deal included a sell-on clause.
Kicker says Freiburg will be due 10 per cent of any fee raised from Soyuncu's sale by Leicester.
The defender has been linked with Barcelona and Manchester City this year.
Soyuncu has a deal with Leicester to 2023.
