With the transfer window now closed, squad numbers are the biggest talking point at the Bernabeu. New boys Mariano, Thibaut Courtois and Vinicius Jr have been handed numbers 7, 25 and 28 respectively.
Following the loan departures of Mateo Kovacic and Theo Hernandez, Valverde and Reguilon are likely to have more chances than ever in and around the first team this season, something that is reflected by their new squad numbers.
Marcelo remains the club's regular left-back, but with Fabio Coentrao having returned to his homeland with Rio Ave, Reguilon will now be the man trusted to provide support and competition for the Brazilian.
Uruguay international Valverde will be tasked with doing the same, giving him the perfect opportunity to build on his loan spell at Deportivo last season.