Pakistan, July 10 -- Newcastle United have signed teenage midfielder Sean Steur from Ajax in a deal worth up to £23m. The 18-year-old landed on Tyneside on Wednesday evening before undergoing a medical and finalising his move. He has signed a five-year contract until 2031. "It's an incredible feeling to be here," Steur said. "It's a giant club in the Premier League and it was always my dream to play in the best league in the world. "I was at home at Ajax - I joined when I was seven and I leave with only good memories - but when a club like Newcastle comes for you, it's really hard to say no." Steur established himself as a regular at Ajax in the second half of last season, starting in the De Klassieker win against Feyenoord at the ag...