Brentford have reportedly made an enquiry over the signing of Crystal Palace defender Joachim Andersen.
Thomas Frank is keen to strengthen his defensive options this season and have already seen a £21m bid rejected for Wolves centre back Nathan Collins.
Collins still tops their list as a potential defender they can build around for the future, but the Bees are also considering alternative options.
The Athletic have reported that they have made an enquiry over Palace defender Joachim Anderson, who they value at around £20m.
However, they have been told by Palace that the Danish international is not for sale and that the Eagles would demand a higher fee if he was available.