The 11 best deals of the January transfer window

Erling Braut Haaland moved from RB Salzburg to Borussia Dortmund.

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Cost: $22 million

Why he's a good buy: Five goals in 57 minutes of football for his new side tell you all you need to know. Haaland hit a hat-trick off the substitute bench on his Dortmund debut against Augsburg, before adding two more a week later, again as a sub, in a 5-1 win over Cologne.

The 19-year-old's total for the season is now 33 goals in all competitions.

It was one in, one out at Dortmund as Paco Alcacer left for Villarreal.

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Cost: $25.6 million

Why he's a good buy: Villarreal are the lucky beneficiaries of Erling Braut Haaland's move to Borussia Dortmund, as it meant Paco Alcacer became surplus to requirements.

The Spain international already has a good scoring record in Spain, having hit 58 goals in five seasons with Valencia and Barcelona. He didn't fare badly at Dortmund either, scoring 26 times in 46 games.

Dani Olmo attracted interest from all over, but chose to leave Dinamo Zagreb for RB Leipzig.

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Cost: $22.8 million

Why he's a good buy: FC Barcelona, AC Milan, and Borussia Dortmund were three clubs interested in the 21-year-old Spaniard, according to Forbes. But Leipzig won the race to sign the midfielder.

In Olmo, the Bundesliga leader acquired a skillful, smart, and versatile attacker, who may be the man to help the team win its first ever German title.

Christian Eriksen ended his seven year spell at Tottenham Hotspur by moving to Inter Milan.

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Cost: $22 million

Why he's a good buy: Eriksen may not have been at his best in his final days as a Spurs player, but his record since joining the club in 2013 is great.

In 226 top flight games, the Dane created 66 goals and scored 51 times from midfield. He's also the only player in England other than David Beckham to manage 10+ assists in four consecutive campaigns.

Gabriel Barbosa made his loan move to Flamengo from Inter Milan permanent.

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Cost: $20.4 million

Why he's a good buy: Making "Gabigol" a Flamengo player permanently was a no-brainer for the Brazilian champion.

He scored 42 times in 55 games last season, firing Jorge Jesus' side to the Campeonato Brasileiro and the Copa Libertadores the latter in which he scored twice in the dying minutes of the final to secure a remarkable late turnaround against River Plate.

Olympique Lyonnais signed Karl Toko Ekambi from Villarreal CF.

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Cost: Loan ($4.4 million fee)

Why he's a good buy: Ekambi won La Liga's Player of the Month award for October 2019, thanks to three goals in four games. He added one more before moving to Lyon, but got off to the perfect start at his new home, finding the net with a cool finish on his debut against Toulouse.

Should he continue in the same vain, Lyon has the option to buy him permanently in the summer for $11.5 million.

Manchester United finally landed Bruno Fernandes from Sporting Lisbon.

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Cost: $63.1 million

Why he's a good buy: The most expensive transfer of the month, Portuguese playmaker Fernandes arrived at Manchester United with a big reputation.

He was voted in the Team of the Tournament as his country won the UEFA Nations League last year, and scored 59 goals from midfield for Sporting Lisbon over the past two-and-a-half seasons. United coach Ole Gunnar Solsjkaer will hope the 25-year-old can fill the creative void in his team's midfield, so the player has similar success at his new club.

Jean-Clair Todibo swapped Spain for Germany, and FC Barcelona for Schalke.

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Cost: Loan ($1.7 million fee)

Why he's a good buy: Schalke has acquired the winning combination of a strong, fast, and tactically astute central defender.

Todibo joined on loan, with the German club has an option to make the deal permanent next summer for a fee of $27.5 million.

The only caveat however is that Barcelona also put a buy-back clause in his contract, meaning it can force the player's return whenever it wishes.

Dutchman Steven Bergwijn was a late signing for Tottenham Hotspur from PSV.

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Cost: $35.1 million

Why he's a good buy: With Harry Kane out for the season, no out-and-out second striker at the club, and Lucas Moura and Son Heung-min misfiring, Tottenham has been struggling in front of goal.

Manager Jose Mourinho is hoping Bergwijn a silky skilled, direct attacker who can play either out wide or as a number 10 can be the man to change that. Five goals and 10 assists in 16 games this term for PSV suggests he can.

Krzysztof Piatek left AC Milan for Hertha Berlin after just a year in Italy.

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Cost: $30.1 million

Why he's a good buy: Hertha Berlin has been the surprise spender across Europe this month, spending more than $90 million on new talent.

Jurgen Klinsmann's side is floating dangerously above the Bundesliga relegation zone, mostly thanks to a lack of cutting edge in front goal. It scored just 24 times all term.

Piatek, who has scored 35 times in his last 62 games for Genoa and AC Milan, has been brought to improve that total.

Yannick Carrasco returned to Atletico Madrid just 2 years after leaving.

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Cost: Loan

Why he's a good buy: Atletico Madrid needs short term cover in the wide positions, with Thomas Lemar currently not performing. Who better to turn to than its former star Yannick Carrasco, who left the club in 2018 for the Chinese Super League?

The Belgian winger knows the club, most of his teammates, and manager Diego Simeone well, meaning he is likely to hit the ground running at the Wanda Metropolitano Stadium.