Newcastle United are sweating over senior transfers, but have been able to complete a deal for a player who made his professional debut at the age of 15-years-old. Paul Mitchell is yet to enhance Eddie Howe’s first-team squad since being appointed as sporting director, but there is hope that Newcastle are close to a transfer breakthrough. That is vital, as the new Premier League season is less than three weeks away. The fact that Newcastle United have not made any major additions beyond Lloyd Kelly’s free transfer is concerning. But while the senior side awaits reinforcements, the youth setup …