It was a testament to Jude Bellingham's talent that Borussia Dortmund decided to pay nearly £21 million to acquire him from Birmingham City after just one season of senior football.
Bellingham is one of Borussia Dortmund's most valuable assets. The 18-year old, who was heavily linked with Manchester United before moving to Germany, made 19 starts in the league last season, scoring one goal and providing three assists.
The midfielder was included in the England squad for Euro 2020, and showed glimpses of his quality at the tournament. Bellingham has been linked with a move to Manchester United once again, with Chelsea rumoured to be a potential destination as well. Borussia Dortmund do not sell cheap though.
One of the best players in world football, Kylian Mbappe has been heavily linked with a move away from Paris Saint-Germain for some time now.
Mbappe, who cost Paris Saint-Germain £130.5 million from AS Monaco, has been sensational for the Parisien giants. In 171 appearances in all competitions, the France international has scored 132 goals and provided 61 assists, and was pivotal in his country winning the World Cup in 2018.
The 22-year old has long been linked with Real Madrid, and it has been suggested that Los Blancos are collecting funds in order to secure his signature. Mbappe's contractual situation with Paris Saint-Germain remains unresolved, and a saga could be brewing.
The best young striker in world football, Erling Braut Haaland is also one of the best strikers in the world.
The Norway international moved to Borussia Dortmund in January 2020 after a successful stint with Red Bull Salzburg, and has been in world-class form for the Bundesliga giants. In 59 appearances in all competitions, Haaland has scored 57 goals and provided 15 assists.
The 21-year old is unlikely to remain at Borussia Dortmund for long. Haaland has been linked with some of the biggest clubs in Europe, with Chelsea keen on signing him this summer. However, Borussia Dortmund have admitted that they intend to keep Haaland this summer.