Rangers are set to make Hull City and Croatia goalkeeper Ivor Pandur their fourth summer signing.
Jack Butland will move in the opposite direction as he completes a return to the Premier League as part of the deal.
The Ibrox side will pay a net fee of £3million, according to the Rangers Review. £6m is the agreed for Pandur, £3m for Butland.
Following an unconvincing season, the 33-year-old's position as Rangers No.1 was under threat and he now moves on.
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Pandur is set to take the gloves under new manager Derek McInnes will Liam Kelly his rival for the position having signed a new deal.
Butland will team up with former Ibrox teammates Kieran Dowell and John Lundstram at the EPL new boys.
Pandur is currently at the World Cup but hasn't played a game with Dominik Livaković starting between the sticks and likely to continue.
He is likely to be a Rangers player by the time Croatia's World Cup adventure is over.
