Inter sent a scout to watch Frenkie de Jong in the Netherlands’ Nations Cup opener against France on Sunday, according to Corriere dello Sport.
The Ajax star played the full 90 minutes of the 2-1 defeat to Les Bleus in Paris, showing his class on and off the ball against the world’s best team.
The 21-year-old, who still has four years remaining on his contract at the Johan Cruijff Arena, has also been monitored by Barcelona, Manchester City and Chelsea.
The Serie A side though will face tough competition from Barcelona, who are keen to sign the player in the January transfer window.
It is believed a bid of as much as €60 million may be enough to get the deal over the line.
The 24-year-old was a vital cog in the Partenopei machine last season, netting seven goals in 47 games in all competitions.
His impressive showings in Serie A led to interest from Los Blancos, as well as Liverpool and Man City, but Napoli remain adamant that the player is happy at Stadio San Paolo.
The Poland international recently penned a new contract in Italy which includes a €120 million release clause.
The 23-year-old is one of European’s most promising young players and is being viewed as a long-term replacement for the ageing Fernandinho at the Etihad Stadium.
Dortmund are keen to keep hold of the youngster but could be resigned to losing him if City put their full weight behind a transfer bid in the January transfer window.