January 31 will be the last day in which teams will be able to boost their squads. Get a hold of all major deals here.

We are halfway through in the 2018-19 campaign, and teams from all over the world are still trying to find a bit of an edge over their opponents in order to reach their particular goals.

Historically, transfers that take place in the winter do not involve many big names, but this time, loan deals are being worked out between top-caliber clubs in Europe, which means that many talented footballer could switch sides before the end of the month.

Furthermore, UEFA's changes that allow footballers to play for two teams involved in the UEFA Champions League or UEFA Europa League have expanded all possibilities. With that in mind, let's have a day-by-day look on what has gone down during the winter transfer window.

Here's a list of the top 25 teams around the world, and how their transfer window has developed.

Arsenal

No confirmed transfers.

Atlético Madrid

Transfers IN: Alvaro Morata (loan).

Transfers OUT: Gelson Martins (loan).

Barcelona

Transfers IN: Jeison Murillo, Kevin Prince-Boateng ($2.2M), Frenkie de Jong ($85M).

Transfers OUT: Munir El Haddadi ($1.2M), Paco Alcácer ($29M).

Bayern München

Transfers IN: Alphonso Davies ($13M)

Transfers OUT: None.

Benfica

Transfers IN: None.

Transfers OUT: None.

Borussia Dortmund

Transfers IN: Paco Alcácer ($29M), Leonardo Balerdi ($17M).

Transfers OUT: Sebastian Rode (loan).

Chelsea

Transfers IN: Christian Pulisic ($75M), Gonzalo Higuaín (loan).

Transfers OUT: Cesc Fábregas ($11.4M), Christian Pulisic (loan to Borussia Dortmund), Alvaro Morata (loan).

Fenerbahce

Transfers IN: None.

Transfers OUT: Diego Reyes (loan deal).

Galatasaray

Transfers IN: None.

Transfers OUT: None.

Inter Milan

Transfers IN: None.

Transfers OUT: Gabriel Barbosa (loan).

Juventus

Transfers IN: Martín Cáceres (loan).

Transfers OUT: Gonzalo Higuaín (loan deal).

Liverpool

Transfers IN: None.

Transfers OUT: Dominic Solanke ($21.9M), Nathaniel Clyne (loan).

Manchester City

Transfers IN: None.

Transfers OUT: Brahim Díaz ($20M)

Manchester United

Transfers IN: None.

Transfers OUT: None.

Milan

Transfers IN: Lucas Paquetá ($40M).

Transfers OUT: Gonzalo Higuaín (loan deal via Juventus).

Monaco

Transfers IN: Fode Ballo-Touré ($12.75M), Cesc Fábregas ($11.4M), Naldo ($2.3M), William Vainqueur (loan).

Transfers OUT: None.

Napoli

Transfers IN: None.

Transfers OUT: Marko Rog (loan deal).

Porto

Transfers IN: Pepe (free transfer).

Transfers OUT: None.

PSG

Transfers IN: Leandro Paredes ($45M).

Transfers OUT: Tim Weah (loan), Jesé (loan).

Real Madrid

Transfers IN: Brahim Díaz ($20M).

Transfers OUT: Kiko Casilla (released).

Roma

Transfers IN: None.

Transfers OUT: Umar Sadiq (loan).

Sporting Lisbon

Transfers IN: None.

Transfers OUT: None.

Tottenham Hotspur

Transfers IN: None.

Transfers OUT: Mousa Dembelé ($14M).

Top confirmed transfers by day

January 31 transfers

- Jonny Otto (Atlético Madrid to Wolves, $23.6M, permanent transfer).

- Miguel Almirón (Atlante United to Newcastle, $27.5M, permanent transfer).

- Georges-Kevin Nkoudou (Tottenham to Monaco, loan deal).

- Rubén Sobrino (Alavés to Valencia, $5.9M, permanent transfer).

- Facundo Roncaglia (Celta Vigo to Valencia, loan deal).

- Emile Smith-Rowe (Arsenal to RB Leipzig, loan deal).

- Peter Crouch (Stoke City to Burnley, free transfer).

- Emerson (Atlético Mineiro to Barcelona, $13.8M, permanent transfer).

- Emerson (Barcelona to Real Betis, loan deal).

- Shinji Kagawa (Borussia Dortmund to Besiktas, loan deal).

- Youri Tielemans (Monaco to Leicester City, loan deal).

- Adrien Silva (Leicester City to Monaco, loan deal).


January 30 transfers

- Sandro Wagner (Bayern to Tianjin Teda, $5.7M, permanent transfer).

- Rabbi Matondo (Manchester City to Schalke 04, $10.3M, permanent transfer).

- Denis Suárez (Barcelona to Arsenal, loan deal).

- Rubén Vezo (Valencia to Levante, loan deal).


January 29 transfers

- Leandro Paredes (Zenit to PSG, $34M, permanent transfer).

- Jesé Rodríguez (PSG to Real Betis, loan deal).

- Martín Cáceres (Lazio to Juventus, loan deal).

- Marko Rog (Napoli to Sevilla, loan deal).

- Uriel Antuna (Manchester City to LA Galaxy, loan deal).


January 28 transfers

- Medhi Benatia (Juventus to Al Duhail, $9.5M, permanent transfer).

- Lucas Ribeiro (Vitoria to Hoffenheim, $4.6M, permanent transfer).

- Alvaro Morata (Chelsea to Atlético Madrid, loan deal).


January 27 transfers

- Tony Sanabria (Real Betis to Genoa, loan deal).

- Gelson Martins (Atlético Madrid to Monaco, loan deal).

- Bakary Sako (West Brom to Crystal Palace, loan deal).


January 26 transfers

- Joel Campbell (Frosinone to Club León, undisclosed).


January 25 transfers

- Victor Moses (Chelsea to Fenerbahce, loan deal).

- Matt Miazga (Chelsea to Reading, loan deal).


January 24 transfers

- Chris Richards (FC Dallas to Bayern München, $1.5M, permanent deal)

- Stefan Simic (Milan to Frosinone, loan deal)

- Takashi Inui (Real Betis to Alavés, loan deal)


January 23 transfers

- Frenkie De Jong (Ajax to Barcelona, $85M, permanent deal - transfer set to take place in June-)

- Krzysztof Piatek (Genoa to Milan, $35M, permanent transfer)

- Gonzalo Higuaín (Milan to Chelsea, via Juventus, loan deal)

- Mario Balotelli (OGC Nice to Marseille, free deal).


January 22 transfers

- Chris Mepham (Brentford to Bournemouth, $13.6M, permanent deal).


January 21 transfers

- Kevin Prince-Boateng (Sassuolo to Barcelona, $2.2M, loan deal)


January 19 transfers

- Emiliano Sala (Nantes to Cardiff City, $17M, permanent transfer)


January 17 transfers

- Kiko Casilla (Real Madrid to Leeds United, undisclosed fee, permanent transfer).

- Mousa Dembelé (Tottenham Hotspur to Guangzhou R&F, $14M, permanent transfer).


January 16 transfers

- Yangel Herrera (Manchester City to SD Huesca, undisclosed fee, loan deal).


January 15 transfers

- Ryan Babel (Besiktas to Fulham, undisclosed fee, permanent transfer).

- Hamed Junior Traoré (Empoli to Fiorentina, $13.7M, permanent transfer).

- Hamed Junior Traoré (Fiorentina to Empoli, loan deal).


January 14 transfers

- Leonardo Balerdi (Boca Juniors to Borussia Dortmund, $17M, permanent transfer).


January 12 transfers

- William Vainqueur (Antalyaspor to Monaco, undisclosed fee, loan deal).


January 11 transfers

- Max Wöber (Ajax to Sevilla, $12M, permanent transfer).

- Munir El Haddadi (Barcelona to Sevilla, $1.20M, permanent transfer).

- Cesc Fábregas (Chelsea to Monaco, $11.4M, permanent transfer).

- Manolo Gabbiadini (Southampton to Sampdoria, $13.9M, permanent transfer).


January 10 transfers

- Diego Lainez (Club América to Real Betis, $17M, permanent transfer).

- Fode Ballo-Touré (Lille to Monaco, $12.75M, permanent transfer).


January 9 transfers

- Cristian Ganea (Athletic Club to Numancia, undisclosed fee, loan deal).


January 7 transfers

- Vicente Iborra (Leicester City to Villarreal, $11.6M, permanent transfer).

- Tim Weah (PSG to Celtic, undisclosed fee, loan deal).


January 6 transfers 

- Brahim Díaz (Manchester City to Real Madrid, $20M, permanent transfer).

- Jermain Defoe (Bournemouth to Rangers, undisclosed fee, loan deal).


January 5 transfers

- Jandrei (Atlético Chapecoense to Genoa, $2.7M, permanent transfer).


January 4 transfers

- Lucas Paquetá (Flamengo to AC Milan, $40M, permanent transfer).

- Dominic Solanke (Liverpool to Bournemouth, $21.9M, permanent transfer).


January 3 transfers 

- Naldo (Schalke 04 to Monaco, $2.3M, permanent transfer).

- Jakub Blaszczykowski (released by Wolfsburg).


January 2 transfers

- Christian Pulisic (Borussia Dortmund to Chelsea, $75M, permanent transfer).

- Christian Pulisic (Chelsea to Borussia Dortmund, loan deal).


January 1 transfers

- Benik Afobe (Wolves to Stoke City, $15M, permanent transfer).

- Alphonso Davies (Vancouver Whitecaps to Bayern München, $13M, permanent transfer).

- Luis Muriel (Sevilla to Fiorentina, undisclosed fee, loan deal).

- Samir Nasri (joins West Ham as a free agent).


Deals announced before January 1

- Amadou Haidara (Red Bull Salzburg to RB Leipzig, $20.8M, permanent deal, December 23).

- Jeison Murillo (Valencia to Barcelona, loan deal, December 20).

- Matheu Flamini (joins Getafe as a free agent, December 19).

- Paco Alcácer (Barcelona to Borussia Dortmund, $29M, permanent transfer).