Former Dons skipper Ryan Jack was expected to complete his move to Rangers today.
Reports claim Jack had already undergone a medical with the Ibrox club and was poised to be confirmed as their second signing of the close season.
The Gers completed their move for veteran Portuguese defender Bruno Alves yesterday.
Jack was stripped of the Aberdeen captaincy when he confirmed he planned to leave Pittodrie in the summer and it became clear he was heading for Rangers.
That came after the 25-year-old had suggested to Dons boss Derek McInnes that he was planning to move to England when his contract with them expired.
Jack had never publicly commented on what he planned to do.
Gers manager Pedro Caixinha had also upset the Dons by speaking openly about his intention to sign Jack and admiration for the Aberdonian ahead of their final league clash of the season.
McInnes still picked Jack from the start in their Scottish Cup final clash with Celtic and he left the Hampden pitch in tears after their 2-1 defeat.
Jack came through Aberdeen’s youth academy and made 250 appearances for the Dons, scoring 11 goals.
He was also capped at Under-21 level for Scotland and has been involved with the senior squad.
The Dons have also confirmed defender Ash Taylor has left the club.
Back-up goalkeeper Neil Alexander, Peter Pawlett and attacker Niall McGinn have also moved on.
Pawlett has already signed a pre-contract deal with MK Dons, the others have still to confirm what their plans are.
Strikers Cammy Smith and Lawrence Shankland and goalkeeper Aaron Lennox, who had been out on loan last season in the Championship, have also left.
Smith, who was in the Dons squad that won the League Cup in 2014, has already signed for St Mirren.
The Dons had earlier confirmed under-20 players Robbie Mutch, Jamie Henry, Dylan Thomas, Aaron Norris and Joe Nuttall had been released.
Ryan Christie has returned to Celtic after his loan spell.
Hopes of him returning as part of a transfer deal involving Jonny Hayes are reported to have hit a hitch because Christie is keen to remain with Celtic to fight for a first team place