The CIES Football Observatory is an institution that provides regular updates on the downgrade or upgrade of a footballer's market value. Market value differences occur on the basis of the players' personal record during that period of time.
Here are the market values of the top seven footballers during that period of time:
7. Harry Kane (€155.2 million)
Despite his injury struggles and inability to make an impact in the Champions League final, Tottenham Hotspur skipper Harry Kane remains one of the best strikers in the world. His presence in the team makes them much more threatening at all times, and he has scored 17 goals in 28 appearances this season.
6. Sadio Mane (€157.8 million)
Liverpool's mercurial winger, Sadio Mane is an unpredictable presence in the famed triumvirate. A player who can play just as well on either wing, he has proved to be the Reds' go to man when it comes to the biggest of games.
He has scored 26 goals this season, helping Liverpool break their trophy drought and playing a key part in their Champions League miracle.
5. Jadon Sancho (€159.4 million)
One of the most remarkable surprises of the season, young Jadon Sancho has taken to top level football like a duck to water. The Bundesliga defences have been thrust open by the England international, with Sancho assisting 19 times and seeing himself linked to clubs like Manchester United.
4. Lionel Messi (€167.4 million)
Arguably the best player in the world right now, Lionel Messi only seems to get better with age. Having scored an incredible 51 goals this season, the only reason he is behind three players on this list is due to his age.
Having led the Blaugrana to another league title, the Argentine magician continues to do what he do best.
3. Raheem Sterling (€207.8 million)
The Manchester City man is one of Pep Guardiola's shining stars in a young and constantly improving side. The England international has scored 25 goals and assisted 18 times for the Citizens this season, helping them win a historic domestic treble this season.
2. Mohamed Salah (€219.6 million)
It has been a dramatic rise to fame for the Egyptian winger over the last two seasons, scoring or assisting almost a goal a game for the Reds, shedding himself of the reputation that he previously earned in Chelsea.
Mohamed Salah has truly become one of the best players in the world, and his market value is a result of that. While being linked to Real Madrid and Bayern Munich, he looks more than content at the home of the European champions.
1. Kylian Mbappe (€252 million)
The teenager has blossomed into a fully blooded elite player this season, as the one aspect that has haunted gifted youngsters has been overcome to an extent: consistency. That consistent rise in stature has seen his rise in market value, now at a ridiculous €252 million.
He has talked about moving to a bigger better project a couple of times this season, with Real Madrid being strongly linked.