Real Madrid believe their $137 million transfer for Jude Bellingham should be viewed as a bargain given his instant impact and long-term potential, sources tell ESPN.

Sources told ESPN that Madrid think the investment in Bellingham can already be considered a success, both on and off the pitch, and his price tag will "end up looking cheap" because he will "define an era" at the club.

Bellingham has scored eight goals in eight LaLiga starts and has also scored in both Champions League matches.

He's "a professional, from head to toe" a teammate told ESPN, saying he immediately won over the dressing room in pre-season.

"His physique surprised everyone," the source said.

The club believe that Bellingham can be key to growing Madrid's already global brand in English-speaking markets.