Leon Goretzka is set leave Schalke as a free agent next summer after failing to sign a new contract with the German side.
Chelsea, Manchester United and Liverpool are reportedly among the clubs monitoring the situation of the 22-year-old midfielder according German media outlet Bild.
Barcelona and Bayern Munich are also reportedly interested in signing Goretzka.
Goretzka has long been regarded as one of the top young players in the Bundesliga, having established himself as a regular for Schalke since the 2013/14 season.
To get a top talent like Goretzka on a free will be a good piece of business for Chelsea with Bild estimating the 22-year-old would have commanded a fee of £62million in this current market.