Naby Keita collapsed after RB Leipzig's 1-0 defeat to Wolfsburg on Saturday.
The 22-year-old collapsed after the game at the Red Bull Arena and was taken straight to hospital.
Keita reportedly suffered circulatory problems, is being kept in hospital overnight as a precaution.
German reports have claimed that the Guinea-born midfielder is conscious following the incident.
Liverpool and Arsenal have been linked with Keita.