Disgree with the "inexperienced, young, will take time to adapt to league" type comments.
He is 23 near 24, just the right age to still progress yet still mature enough in years. He has also had a period at arguably the biggest club in the world, he has spent time at pretty much all the major leagues in Europe excluding the premiership and Serie A.
So on paper he looks a gret fit, also like the look of him in videos...but had never heard of him until a few months ago, dont remember him at Barcelona at all, nor for Schalke or Benfica....and that is where my concerns are.
Barca seemed massively keen on him movign so early, giving him a big shirt number....he didnt last long, on his two loan spells it seems neither Schalke or Benfica fancied him much while he was there, he barely played....both had loan and purchase options and didnt take them up, he also though calle dup hasnt played for France bar less than 10 games at U20 despite success at both clubs in the league.
So you part wonder, is there a reason he hasnt succeeded outside of the French league (but he was still young) or not played for France (well I massively rate Lukeba and he hasnt as of yet, they have a abundance of quality cb's still find it weird Disasi has over them, he is gonna flop at Chelsea).
But for me Lindelof has never consistently been anything other than average and never will be and has lots of weaknesses, so a young signing like this to compete with him as Varanes back up, looks a good signing to me and if Varane misses games like he has frequently so far, especially beign another year older....there are opportunities for him here for sure this coming season