| Aílton | Terek (RUS) |  Brazil | Forward |
| Aimar, Pablo | Benfica (POR) |  Argentina | Midfield |
| Aina, Temitayo | England U17 |  England | Defender |
| Ainsalu, Mihkel | Estonia U17 |  Estonia | Midfield |
| Aislan | Sion (SUI) | Brazil | Defender |
| Aissati, Ismaïl | Antalyaspor (TUR) |  Morocco | Midfield |
| Aitchison, Darren | Balzan (MLT) | England | Forward |
| Aït-Fana, Karim | Montpellier (FRA) |  France | Forward |
| Aitymova, Aigerim | Kazakhstan WOCO |  Kazakhstan | Midfield |
| Ajdarević, Astrit | Standard Liège (BEL) / Sweden U21 |  Sweden | Midfield |
| Ajeti, Arlind | Basel (SUI) |  Switzerland | Defender |
| Ajeti, Albian | Switzerland U17 | Switzerland | Forward |
| Ajouaou, Ahmed | Antwerpen (BEL) |  Belgium | Forward |
| Akahoshi, Takafumi | Pogoń (POL) |  Japan | Midfield |
| Akar, Mertjan | Azerbaijan U17 |  Azerbaijan | Goalkeeper |
| Akdari, Erdal | Kayserispor (TUR) |  Turkey | Defender |
| Aké, Nathan | Chelsea (ENG) / Netherlands U19 |  Netherlands | Defender |
| Akelyte , Monika | Lithuania WU19 |  Lithuania | Midfield |
| Akerhaugen, Toril | Stabæk (NOR) / Norway WOCO |  Norway | Defender |
| Akgün, Mehmet | Beşiktaş (TUR) |  Germany | Forward |
| Akharraz, Osama | AGF (DEN) / Denmark U21 |  Denmark | Defender |
| Akhmetov, Yeldos | Taraz (KAZ) / Kazakhstan U21 | Kazakhstan | Defender |
| Akimova, Anastasia | Rossiyanka (RUS) / Russia WOCO |  Russia | Defender |
| Akinfeev, Igor | CSKA Moskva (RUS) / Russia | Russia | Goalkeeper |
| Akkerman, Lucie | Netherlands WU17 | Netherlands | Defender |
| Akopov, Ernest | Iberia Star (GEO) / Armenia FUT |  Armenia | Goalkeeper |
| Akouili, Sofian | Willem II (NED) |  Netherlands Antilles | Midfield |
| Akpala, Joseph | Bremen (GER) |  Nigeria | Forward |
| Akpan, Hope | Reading (ENG) | England | Midfield |
| Akpom, Chuba | Arsenal (ENG) / England U19 | England | Forward |
| Akpoveta, Oke | Brøndby (DEN) | Nigeria | Forward |
| Aksentijević, Nikola | Vitesse (NED) |  Serbia | Midfield |
| Aksentijević, Miodrag | Ekonomac (SRB) / Serbia FUT | Serbia | Goalkeeper |
| Aktaou, Fahd | Heerenveen (NED) | Netherlands | Defender |
| Akubardiia, Badri | Dynamo Kyiv (UKR) |  Ukraine | Defender |
| Akursmørk, Katrina | Klaksvík (FRO) / Faroe Islands WU17 |  Faroe Islands | Defender |
| Akyuz, Mehmet | Beşiktaş (TUR) | Turkey | Forward |
| Alaba, David | Bayern (GER) / Austria |  Austria | Midfield |
| Aladağ, Emin | Akhisar (TUR) | Turkey | Midfield |
| Aladzhov, Ivelin | Bulgaria U19 |  Bulgaria | Defender |
| Aladžić, Marijo | Bosnia and Herzegovina FUT |  Bosnia and Herzegovina | Forward |
| Alaj, Ramadan | Albania FUT |  Albania | Midfield |
| Alajääski, Emilia | Finland WU17 |  Finland | Defender |
| Alakbarov, Farid | Azerbaijan FUT | Azerbaijan | Forward |
| Alan | Braga (POR) | Brazil | Midfield |
| Alan | Salzburg (AUT) | Brazil | Forward |
| Alan Kardec | Benfica (POR) | Brazil | Forward |
| Alan Patrick | Shakhtar Donetsk (UKR) | Brazil | Midfield |
| Alanen, Emmi | Finland WOCO | Finland | Midfield |
| Alanzinho | Trabzonspor (TUR) | Brazil | Midfield |
