Lozano, 19, has signed an agreement running until 2030, with Athletic retaining an option to extend it by at least a further two seasons. The striker is approaching the end of his recovery from a serious anterior cruciate ligament injury suffered while on loan at Racing Santander last season.
Imga has also committed his future to the Basque club, signing a deal until 2031 with an additional year available to Athletic. His agreement includes a reported release-clause structure rising from around âŹ70million to approximately âŹ85million in the final season.
The renewals form part of a busy period for Athletic, who have also secured the future of Monreal. The three players signed their agreements several days before the club began releasing promotional photographs, with director of football Mikel GonzĂĄlez pictured alongside the academy talents.
Lozano's new contract rewards a player whose progress had attracted considerable attention before injury interrupted his first experience of senior football.
After scoring 23 goals in 33 appearances for Athletic Club's first youth team, the Navarra-born striker began the following campaign with Basconia. He also made an impact in European youth competitions, scoring six goals in six UEFA Youth League appearances and adding another in the Premier International League.
His performances for the club and Spain's youth teams attracted the attention of Racing sporting director Chema AragĂłn, who requested a loan move. Athletic had not provided him with a place in their first-team pathway at Primera RFEF level, while Racing offered the opportunity to play in Spain's second division.
Lozano made an immediate impression, scoring twice in five appearances before suffering a rupture of the anterior cruciate ligament in his right knee during a training session in February.
He had already enjoyed a memorable spell at El Sardinero, including a Copa del Rey tie against Barcelona in which two of his goals were ruled out. He also came close to scoring a late equaliser after Racing broke forward in a two-against-one situation, choosing to shoot rather than pass to team-mate AndrĂ©s MartĂn.
The injury required surgery and has kept him out since February. His recovery is now nearing its final stage, with the plan for him to return through Bilbao Athletic before being considered for the first team's next pre-season preparations.
Imga's new agreement is another significant piece of business for Athletic, who have acted quickly to protect a player attracting considerable attention from clubs across Europe.
The left-footed winger, who stands close to 1.90 metres tall and operates from the left despite favouring his right foot, arrived from Alavés after developing in their youth system. He had begun the 2024-25 season with Alavés' Juvenil B side while his representatives negotiated a move to Bilbao for the following summer.
When Alavés discovered the agreement, they attempted to retain him with a contract extension until 2027. Imga rejected the offer and was subsequently left out of the team, spending several months unable to play with his Juvenil B team-mates.
Athletic responded by bringing the transfer forward to the winter window, although competition regulations prevented him from immediately joining the club's Juvenil B side because he had already played official matches in the same competition for Alavés.
That period became a transitional stage in his development. His progress has since accelerated dramatically, with Imga moving directly into Bilbao Athletic without first playing for Basconia.
His performances quickly attracted the attention of first-team coach Terzic. Imga made his senior debut at San Mamés against Getafe, coming on for Nico Williams, before scoring his first goal for the senior side in a Copa del Rey tie against Prat.
The winger is now increasingly involved in first-team plans and has attracted enquiries from as many as 15 Champions League clubs, including several from Spain. Athletic's decision to accelerate negotiations reflects their determination to keep hold of a player regarded as one of the academy's brightest prospects.
Imga is also preparing to represent his country at the Under-17 World Cup, alongside Athletic goalkeeper Darlington, another highly regarded young talent who joined from Manchester United.
By securing Lozano and Imga, alongside Monreal, Athletic have strengthened the foundations of their academy squad. For Lozano, the immediate priority is completing his rehabilitation and returning to competitive football. For Imga, the challenge is to build on a rapid rise that has already taken him from youth football to the first team.