Wales call up teenager Keelan Giles to squad for Argentina clash

• ‘He has got a bit of X-factor’ says Neil Jenkins of 18-year-old Ospreys wing• Decision on availability of Alun Wyn Jones to be made in coming daysWales have called up the 18-year old wing Keelan Giles as they look to get up to speed against Argentina on Saturday after last weekend’s chastening defeat to Australia dropped them to seventh in the world rankings.Giles, who has scored eight tries for Ospreys this season after impressing for Wales at under-20 level, replaces Hallam Amos, who suffered a shoulder injury that may require surgery after coming on as a replacement against the Wallabies.…