Leaving Barças famed La Masia youth academy, Olmo opted to join Dinamo Zagreb where he is now into his sixth season, earning rave reviews across Europe for his performances and scooping four Croatian First Football League titles.
His displays have not gone unnoticed with Robert Moreno neither, with the Spanish boss handing the 21-year-old his first senior call-up for the recent Euro 2020 qualifying match with Malta. La Furia Roja saw off the European minnows with consummate ease, running out 7-0 winners, with Olmo notching a debut goal for Spain with the fifth strike of the evening.
Speaking to Sport about his dream debut, the Spaniard insisted the faith shown in him by Moreno gave him the confidence to perform well, on what was a convincing night at Estadio Ramón de Carranza.
"The coach showed his confidence in me and said that I was here because of what I have done with my club and the U21s," he said. "I feel very proud. It was better than I dreamed! I am really happy and now thinking about the next game against Romania."
Choosing to depart Spain for Croatia back in 2014, Olmo confessed that his decision to leave La Liga and Barcelona was one that raised many eyebrows at the time. However, he claimed that the move was down to a sporting reasons, with Zagreb offering him a project that was best suited to his development.
"It sounds strange and at first people said I was crazy. No other club made the sporting offer which Dinamo did," he added.
"I could be in the first team dynamic from the second year, but after three months I was promoted from the reserves and I stayed with the first team. They offered me a project for the future, showed they were willing to bet on me, and thats why."