Schalke goalkeeper Alexander Nubel is being watched by Manchester United.
BILD says United are interested in highly rated Schalke keeper Nubel.
The 23-year-old made the breakthrough to the German's sides first-team, starting all seven games in the Bundesliga.
However, his contract expires next summer and United have shown an interest in signing him.
Paris Saint-Germain and Atletico Madrid are also potential suitors.
