Teenage leg-spinner Rehan Ahmed has been added to England's squad for the second Ashes Test against Australia as cover for Moeen Ali. Ahmed, 18, became the youngest man to play Test cricket for England when he was picked to play in Pakistan in December. The Leicestershire player made an eye-catching debut for Ben Stokes's side in Karachi, taking seven wickets in the match and 5-48 in the second innings. But Ahmed has taken just six wickets in seven matches in the second division of the County Championship this season, at an average of more than 67.