Scotland hooker Stuart McInally has warned France not to write Wales off ahead of their Guinness Six Nations clash at Principality Stadium on Friday. France are chasing a first Grand Slam and Championship title since 2010 after wins against Italy, Ireland and Scotland, with Les Bleus safe in the knowledge that victory in Wales will leave just England in the way of a historic clean sweep. Ad/> Meanwhile, Wayne Pivac's Wales sit fifth in the table after a win at home to Scotland came in between defeats away to Ireland and England.