Taiwo Awoniyi was taken off with a stretcher to the hospital during Mainz Bundesliga 1-0 defeat to Augsburg.
The on loan Liverpool striker was involved in a clash of heads with a German-born of Nigerian descent Felix Uduokhai.
The collision with the defender ended in a nasty fall for Awoniyi who was immediately attended to by medical staff on ground.
After a few minutes' delay, the 22-year-old had a brace put on his neck as the forward was taken off the pitch and went straight to the hospital.
Reports from German claim that the Nigerian U23 international was responding to treatment at the hospital.
Awoniyi joined Liverpool in 2015 and has been unable to earn a work-permit which led him to spells in Germany, Holland and Belgium.
The lanky forward's best loan spell was with Belgian side Mouscron where he scored 11 goals in 16 appearances.
He won the U17 World Cup with the Golden Eaglets in 2013 and the African Under-20 Championships two years later.
Mainz lost the match to Augsburg as the only goal came from Florian Niederlechner with just 43 seconds played.
Awoniyi's club are just three points above the relegation zone and their next game would be against Bundesliga contenders Dortmund.