Borussia Dortmund invited Lovro Chelfi to participate in training sessions in Germany as part of a trial. Following a successful trial, they extended an offer to Chelfi to join the club. However, his family believed it would be more beneficial for him to remain at Kustošija for further development. Despite the successful trial and Dortmund's offer, Chelfi's family prioritized his development and the trust built at Kustošija, choosing not to pursue the immediate transfer. This decision underscores their emphasis on his gradual growth and preparedness before moving to a major club, with the belief that staying at Kustošija would provide the suitable environment for him to further refine his skills.