A number of Europe's top clubs including Madrid, Manchester United, Chelsea, Liverpool and Bayern Munich have all been linked with the attacking midfielder, who scored 12 goals in 30 Bundesliga appearances in the 2019-20 campaign.
The 21-year-old is due to face Bayern in Saturday's DFB-Pokal final clash and while Calmund thinks that the Bavarians are interested in signing Havertz, he believes he would prefer a switch to Spain.