The 21-year-old began last season as a squad player but took advantage of injuries in the centre-back position to establish himself in the side, particularly in the second half of the campaign, when he became a regular starter and helped Villarreal secure Champions League qualification.
Navarro made 23 La Liga appearances last season, along with one in the Copa del Rey and three in the Champions League. The previous campaign had brought his top-flight debut at just 19, when he played 16 minutes in a win over Espanyol on matchday seven.
A product of Villarreal's academy, Navarro joined the club at the age of eight and has progressed through its various age groups over the past 12 years to reach the first team. He has now made 46 official appearances for the senior side, a figure he will be looking to add to significantly in the coming seasons.
The centre-back's emergence came at a crucial time for Villarreal, who leaned on academy products to navigate a season disrupted by injuries in defence. His consistent performances in the second half of the campaign played a part in the club securing a return to the Champions League, giving the Yellow Submarine European football at the highest level once again.
The new deal underlines the club's confidence in Navarro as a long-term option in defence, with Villarreal continuing to lean on academy graduates as they prepare for another campaign in European competition. Having broken into the side as cover, Navarro will now be expected to compete for a regular starting role as the club balances domestic and continental commitments next season.
Villarreal's willingness to extend homegrown talent reflects a broader recruitment strategy that has served the club well in recent years, blending academy prospects with shrewd additions from the transfer market to build a competitive squad.