Andersen is a worse player/defender than Simon Kjær at Palermo circa 2009 at this moment in time, IMO. Needs more development to be considered as an option for the elite level and will have a lot of ups and downs (e.g. he was decent vs. Sassuolo or Napoli but shaky vs Torino a few days ago):
The likes of Juventus can afford to sign him (provided the interest is genuine) because he can stashed behind Bonucci and developed into a competent centerback over 2-3 years, but we don't have that luxury — especially considering Lindelöf/Bailly are our young, developmental centerbacks with Tuanzebe being the third. If we absolutely had to sign a young Serie A defender, I'd probably prioritize Milenković over Andersen — the former will have an easier time adapting to the Premier League and is more combative/versatile.