RANKED: The 10 best transfers in European soccer this summer

Age: 26

Position: Striker

Transfer fee: $21 million.

Leipzig sold Werner to Chelsea for $56 million in 2020 and bought him back this summer for over $30 million less.

Yes, the German struggled during his two years at Stamford Bridge, but much of that can be put down to the Blues not playing to his strengths.

It took him just over an hour to re-open his Leipzig account on his second debut for the German club, while he also hit a hat-trick in just 43 minutes in the first round of the DFB-Pokal.

You can bet your bottom dollar he will score plenty more this term now he's back in a system that suits him.

Age: 33

Position: Striker

Transfer fee: $47 million

Lewandowski is one of the greatest goalscorers in modern soccer history.

In eight glorious years at Bayern Munich, the Pole scored 344 goals in 377 games, helping his side win eight consecutive Bundesliga titles, three German Cups, and the UEFA Champions League.

Barcelona prized him away from Bayern this summer and he's since scored four in his first five matches.

There is no doubt he will score plenty more this season. The only question that remains is that at 33, how long can he keep going?

Age: 22

Position: Midfielder

Transfer fee: $87 million

Tchouameni was the third most expensive signing in world soccer this summer.

$87 million is a hefty fee for such a young player, but the combative box-to-box midfielder is already proving to Madrid that he can help fill the boots of the departed Casemiro, who joined Manchester United last month.

"We're not surprised," Madrid manager Carlo Ancelotti said of the Frenchman after he put in an impressive display against Espanyol in August. "He's a spectacular player.

"He plays well in defence and attack. I'm happy with him and I hope he continues to improve."

Age: 25

Position: Striker

Transfer fee: $55 million

Gabriel Jesus scored 95 goals in a five-and-a-half seasons for Manchester City despite being employed mostly as a winger and starting the majority of games on the bench.

Since moving to Arsenal this summer, the Brazilian has proved why Pep Guardiola should have given him the chance to lead the line for the Cityzens.

After scoring seven in pre-season, he's netted three in five Premier League matches and provided three assists, helping fire Arsenal to five consecutive wins and the top of the table.

Age: 30

Position: Forward

Transfer fee: $34 million

Liverpool is struggling for creativity in the final third this season without Sadio Mane.

Bayern Munich, on the other hand, is benefiting hugely from the Senegalese star's arrival.

He's slotted into the German side's fluid front line alongside Serge Gnabry, Kingsley Coman, and Leroy Sane, helping the team score 16 goals – three of which he scored himself – in just four Bundesliga matches.

Age: 28

Position: Forward

Transfer fee: Free

In Dybala, Roma has acquired itself one of the most technically gifted, creative players in world soccer.

Dubbed "The Jewel," the Argentine boasts superb vision, a delicate first touch, and the ability to score from both inside and outside of the box – the latter already demonstrated for his new club with three goals in his first four games.

Most impressively, he cost Roma absolutely nothing.

Age: 22

Position: Striker

Transfer fee: $64 million

Haaland scored 86 goals in 89 games for his former team Borussia Dortmund and has continued in the same vein for Manchester City this season, scoring nine goals in his first five Premier League matches.

No player in the division's history has scored more across the same period.

"City have the best striker in the world right now," the former City striker Dion Dublin told BBC Radio 5 Live after Haaland hit a hat-trick, his second in as many games, against Nottingham Forest.

"If he stays in the Premier League, every record will be broken."