| Kakabadze, Otar | Georgia U21 / Georgia U19 |  Georgia | Midfield |
| Kakambouki, Eleni | Greece WOCO |  Greece | Midfield |
| Kakubava, Levan | Dinamo Tbilisi (GEO) / Georgia U21 | Georgia | Defender |
| Kakulia, Monika | Georgia WU17 | Georgia | Defender |
| Kakuta, Gaël | Vitesse (NED) / France U21 |  France | Forward |
| Kal, Pawel | Korona (POL) |  Poland | Midfield |
| Kalachev, Timofei | Rostov (RUS) |  Belarus | Midfield |
| Kalajdzic, Zeljko | Platanias (GRE) |  Serbia | Midfield |
| Kalambekov, Murat | Kazakhstan U19 |  Kazakhstan | Defender |
| Kalamiza, Ana Marija | Osijek (CRO) / Croatia WOCO |  Croatia | Forward |
| Kalandadze, Lasha | Gagra (GEO) / Georgia U21 | Georgia | Defender |
| Kalas, Tomáš | Vitesse (NED) / Czech Republic U21 |  Czech Republic | Defender |
| Kalatzis, Christos | Asteras (GRE) | Greece | Forward |
| Kalayar, Ersin | İstanbul BB (TUR) |  Turkey | Midfield |
| Kaldaridou, Danai | Greece WU19 / Greece WU17 | Greece | Midfield |
| Kaldirim, Cemal | Bursaspor (TUR) | Turkey | Defender |
| Kaldoja, Kaspar | Tammeka (EST) / Estonia U21 |  Estonia | Midfield |
| Kalenov, Talgat | Kazakhstan U21 | Kazakhstan | Goalkeeper |
| Kalermo, Akseli | Finland U17 |  Finland | Defender |
| Kaleshin, Vitali | Rubin (RUS) |  Russia | Defender |
| Kaletka, Nikol | Poland WU19 | Poland | Midfield |
| Kalezić, Miloš | Montenegro U21 |  Montenegro | Midfield |
| Kali, Cyril | Veria (GRE) | France | Defender |
| Kali, Anouar | Utrecht (NED) |  Netherlands | Forward |
| Kalif, Avi | Asa Ben Gurion (ISR) / Israel FUT |  Israel | Midfield |
| Kalimi, Golan | Maccabi Nahalat (ISR) / Israel FUT | Israel | Midfield |
| Kalinić, Nikola | Dnipro (UKR) / Croatia | Croatia | Forward |
| Kalinić, Lovre | Croatia U21 | Croatia | Goalkeeper |
| Kalinina, Yana | Ukraine WU19 |  Ukraine | Forward |
| Kaljumäe, Marek | Estonia U21 | Estonia | Defender |
| Kallas, Miina | Estonia WOCO | Estonia | Midfield |
| Kallergis, Manolis | Atromitos (GRE) | Greece | Midfield |
| Kallioinen, Tuomas | Ilves (FIN) / Finland FUT | Finland | Goalkeeper |
| Källkvist, Christoffer | Häcken (SWE) |  Sweden | Goalkeeper |
| Kallon, Issa | Netherlands U17 | Netherlands | Forward |
| Källström, Kim | Spartak Moskva (RUS) / Sweden | Sweden | Midfield |
| Kalmár, Zsolt | Hungary U19 |  Hungary | Midfield |
| Kalmenov, Nurbolat | Atyrau (KAZ) / Kazakhstan U21 | Kazakhstan | Goalkeeper |
| Kálnoki-Kis, Dávid | Oldham (ENG) / Hungary U21 | Hungary | Defender |
| Kalogeris, Alexandros | Veria (GRE) | Greece | Midfield |
| Kalonas, Mindaugas | Rävan (AZE) / Lithuania |  Lithuania | Midfield |
| Kalou, Salomon | LOSC (FRA) |  Côte d'Ivoire | Forward |
| Kalsø, Sørmund | KÍ (FRO) / Faroe Islands U21 |  Faroe Islands | Defender |
| Kaltsas, Nikolaos | Veria (GRE) / Greece U21 | Greece | |
| Kaltsidi, Maria | Greece WU17 | Greece | Defender |
| Kaludjerović, Andrija | Montenegro U21 | Montenegro | Midfield |
| Kałużna, Karina | Poland WU17 | Poland | Goalkeeper |
| Kalynychenko, Maxym | Tavriya (UKR) | Ukraine | Midfield |
| Kamara, Diomansy | Eskişehirspor (TUR) |  Senegal | Forward |
| Kamara, Glen | Finland U19 | Finland | Midfield |
