The 18-year-old has returned to Gençlerbirliği on loan for the 2026/27 season.

Ousmane initially made the switch to Turkey in December 2025 after progressing through Académie SOAR in Guinea and made seven senior appearances across the Süper Lig and Turkish Cup.

He has caught the eye of multiple clubs across Europe, and the midfielder continued his rise last season with a senior international debut for Guinea, featuring in a friendly against Northern Ireland at Windsor Park in June.

On his signing, Ousmane said: “From the moment Newcastle showed interest, I knew it was the kind of ambitious club I wanted to be part of. The project here is exciting, and the supporters have an incredible reputation. Feeling that energy behind me is something I’m really looking forward to.

“I always tried to approach every match with total commitment, working hard, giving everything, and pushing myself to improve.

“My aim is to grow as a player and show people what I can bring to the team. I want to help Newcastle compete at the highest level and achieving things that make the club and supporters proud.”

Ross Wilson, Newcastle United Sporting Director, said: "We're very pleased to welcome Ousmane to Newcastle United. He's an exciting talent who has already shown real potential, progressing through a strong programme in Guinea before gaining valuable senior experience in Turkey.

"He's been on the radar of a number of clubs, so we're delighted he sees his future here with us - credit to our scouting team for identifying him early and working hard to get the deal done. It was a pleasure to meet him recently. We are following his progress closely.

"His exposure to first-team football at such a young age, along with his recent international debut, shows the trajectory he's on. Going back to Gençlerbirliği will give him the chance to continue the development he's already shown while remaining firmly within our long-term plans."