It feels as though all of Europe's top clubs are on the lookout for a new centre-back in the summer.
It's the kind of mass hunt that has the relatively smaller sides worried, with their talent firmly in the sights of the big dogs.
Fiorentina will be one of those who will be concerned, with their Serbian central defender Nikola Milenkovic linked with several teams across the continent.
But just who is the coveted centre-back?
Here is everything you need to know about Nikola Milenkovic.
1. Versatile defender
Milenkovic is capable of playing at both centre back and right back, which would add flexibility to anyone's squad.
The right-footed Serbian stands at 6'5, which would make him a dominant presence at set pieces as you would expect.
2. Thrived in Italy
After impressive for his local side Partizan Belgrade, Milenkovic made the move to Tuscany and Fiorentina in the summer of 2017 for a fee believed to be in the region of €5m.
He's made 125 appearances to date, even chipping in with 11 goals, although La Viola have only managed six clean sheets this season.
Still only 22, Milenkovic has plenty of time to fulfil his undoubted potential.
3. Nemanja Vidic comparisons
As you would expect with any promising Serbian defender, Milenkovic has been compared to the great Nemanja Vidic.
Mladen Krstajic, his coach at the 2018 World Cup, called the young defender a 'new Vidic' and praised Milenkovic's composure, tenacity and sound ball control.
Strong and an adept one on one defender, it would seem such comparisons are not misplaced.
4. Scouted by Manchester United
From all the details we have provided so far, it should be no surprise that Milenkovic caught the eye of Jose Mourinho.
The Portuguese was reported to have personally attended a Fiorentina game in 2018 to scout the young defender.
Manchester United were keen but decided to spend £80m on Harry Maguire instead.
5. Impressed at the World Cup
Appearing for his country at the 2018 World Cup in Russia, Milenkovic made a solid impression in an underperforming Serbia team.
He played in all three group games and made 34 successful tackles, the most by any player during the tournament's opening round.
He also impressed with his positional play despite defeats to Brazil and Switzerland. Having only matured and improved since then, it is clear why clubs like West Ham would be interested in his services.