Nigerian striker Taiwo Awoniyi, was stretchered off in the 26th minute and taken to hospital after suffering a serious head injury in Mainz relegation battle at home to Augsburg.
The 2015 U-17 World Cup winner was briefly motionless after landing awkwardly following a clash of heads with Compatriot Felix Uduokhai in the first-half.
Awoniyi was taken out with his neck in a heavy brace after a long delay while he received medical attention on the pitch.
Mainz said Awoniyi was responsive and had been taken to hospital for tests.
Altough still on the books of Premier league Champions in wait Liverpool, The 22 year old has yet to make a competitive appearance for the Reds and has had loan spells at German side FSV Frankfurt, Dutch team NEC and Belgium sides Royal Excel Mouscron and Gent.
With both Augsburg and Mainz just above the relegation places, the visitors took the lead after less than a minute when a volley by Augsburg striker Florian Niederlechner hit the ground and bounced over the Mainz goalkeeper.