Real Sociedad midfielder Jon Martin has attracted interest from Arsenal, Real Madrid, Chelsea and Liverpool, according to journalist Ekrem Konur.
The 20-year-old has emerged as a potential target for several leading European clubs, but Real Sociedad will not enter negotiations unless they receive a transfer offer of at least €50m.
Martin has made six appearances in the current Spanish league season and has been sent off once.
The midfielder is valued at €25m by Transfermarkt, half the amount Real Sociedad reportedly require before considering his sale.
Martin remains under contract with Real Sociedad until the end of June 2032.