Long-serving defender Andy Considine is set to sign a two-year contract extension tying him Aberdeen until summer 2021.
It is understood the new contract will also include the option of another year.
Considine, 32, had triggered a clause in his current contract by meeting an appearance threshold that earned him another year-long deal.
However, the defender had been locked in talks as to the length and terms of a contract.
They have reached a compromise with Considine set to pen the new deal.
Now into his 16th season in the Dons first team, Considine is closing in on a 500th appearance.
Securing Considine will be a timely boost for boss Derek McInnes, who has admitted he faces the busiest transfer window of his six years at the club this summer.
Captain Graeme Shinnie’s contract expires at the end of the season and he looks set to move on with Derby County leading the race to sign the midfielder.
Winger Gary Mackay-Steven also has a contract set to expire in the summer and has been targeted by MLS side New York City.
Centre-back Mark Reynolds has signed a pre-contract with Dundee United, the club he is on loan at.
Deals for keeper Tomas Cerny and defender Greg Halford run out at the end of the season.
Loan agreements for Greg Stewart (Birmingham), Dom Ball (Rotherham) and James Wilson (Manchester United) will also end next month.
McInnes has been in talks with Ball regarding a permanent deal as his contract at parent club Rotherham is set to expire.
The Dons boss was also keen to secure Stewart – who will be a free agent in the summer – on a permanent deal, but Rangers look set to land him.