Neymar joined Paris Saint-Germain from Barcelona for £200million last summer, becoming the most expensive footballer in history.
The Brazilian forward has enjoyed a superb season in Ligue 1, scoring 28 goals in 30 appearances across all competitions before picking up a serious metatarsal injury.
However, it comes as some surprise that Neymar has actually decreased in transfer value since September, according to a new study by CIES Football Observatory.
Liverpool and Tottenham stars are also among the top 10 players who have lost most transfer value in the past six months, but it is a Barcelona forward who has suffered the biggest decrease.
(Only footballers from the top five European leagues who did not change team or extend their contract have been included in the rankings.)
Take a look through the gallery above to see which players have lost most transfer value around Europe in the past six months.