The transfer windows have closed across Europe by now but given just how much these stars are improving then any clubs that wanted to buy them would need some pretty deep pockets.
That's because these are the players whose 2019 has been so impressive that their transfer value has rocketed, at least according to the good folks at transfermarkt.com.
10. Heung-min Son, Tottenham - £71.5million (£26.8million increase)
9. Rodri, Manchester City - £71.5million (£26.8million increase)
8. Jadon Sancho, Borussia Dortmund - £89.3million (£26.8million increase)
7. Everton, Gremio - £35.7million (£29.5million increase)
6. Callum Hudson-Odoi, Chelsea - £31.3million (£31.3million increase)
5. Vinicius Junior, Real Madrid - £62.5million (£31.3million increase)
4. Trent Alexander-Arnold, Liverpool - £71.5million (£31.3million increase)
3. Bernardo Silva, Manchester City - £89.3million (£31.3million increase)
2. Sadio Mane, Liverpool - £107.2million (£40.2million increase)
1. Joao Felix, Atletico Madrid - £89.3million (£78.6million increase)
Gunners4ever❤
9
Hudson Odoi market value £31.3m (an increase of £31.3m) This means hudson odoi had no value before?