Rangers are set for a major transfer breakthrough.Rangers are on the verge of a major breakthrough in the summer transfer market, having struck up a deal for promotion-winning Hull City goalkeeper Ivor Pandur, with Jack Butland set for a surprise switch in the opposite direction.Pandur, 26, has just recently won promotion to the English Premier League with the Tigers and is currently away at the World Cup with Croatia, but is set to become Rangers’ new number one goalkeeper after the two clubs agreed a fee of £6million for the goalkeeper.According to several reports, the arrival of Pandur will coincide with current Ibrox stopper Butland ending his three-year stay with the club by moving in the opposite direction, with Sergej Jakirovic’s side ready to pay a fee in the region of £3million to bring the England international to the MKM Stadium this summer.Jack Butland is set to depart Rangers this summer…