Dayann Methalie has been capped four times at under-21 level by France [Getty Images]Sunderland have agreed a £25.6m fee to sign left-back Dayann Methalie from Toulouse.The 20-year-old French defender is expected to undergo a medical after a verbal agreement was reached for an initial £23.9m, with a further £1.7m in potential add-ons.Methalie made 28 appearances for Toulouse in Ligue 1 last season, scoring twice in his final three games, as they finished ninth.The deal follows