German side Hoffenheim have slapped a US$6m price tag on their Ghanaian defender Isaac Vorsah.

This comes after four clubs in Europe expressed interest in signing the towering centre-back by Friday.

Austrian champions Red Bull Salzburg are among the three clubs and are considered the most serious of the offers brought to Hoffenheim.

Newly-promoted English Reading are also reported to the in the race to sign the centre-back as they seek to boost their defence set-up.

Rival German club Hamburg are also keen on signing the defender which has heightened speculation that he could leave before the transfer window shuts on Friday.

But Red Bulls are said to be the club with the biggest desire to sign the defender as sporting director Ralf Rangnick is a big fan of the defender.

The 6ft 5in Ghanaian, 24, can also play defensive midfield where he excelled in some matches for Hoffenheim.