ABERDEEN have lost out to League One Peterborough United in the race to sign Ross County right-back Jason Naismith.
Aberdeen had made a player-plus cash bid to land Naismith but the defender has penned a three-year deal with the ABAX Stadium for an undisclosed fee, believed to be £250,000.
However the Dons are understood to be closing in on the signing of Republic of Ireland international midfielder Stephen Gleeson.
Free agent Gleeson, 29, spent the second half of last season with Ipswich Town in the Championship after ending a four-year spell with Birmingham but was released when his contract ended.
Dublin born Gleeson has been capped four times for the Republic of Ireland with his latest caps coming last year.
Gleeson began his career with Wolves and then had productive spells at MK Dons and Birmingham where he made more than 100 appearances for both sides.
Dons boss Derek McInnes has already strengthened his squad by securing midfielder Chris Forrester on a three-year contract from Peterborough United.
However the Dons boss lost out to The Posh tonight in the race to land right back Naismith who still had two years left on his contract at relegated Ross County.
Sunderland had also pitched in with a £200,000 bid for Naismith.
Aberdeen had offered a player plus cash deal and it is understood midfielder Greg Tansey was made available.
Tansey had been on loan at Ross County in the second half of the season and an agreement had been in place for him to sign on with the Highlanders.
However that collapsed when Ross County were relegated to the Championship.
Tansey will report for pre-season training when the Dons return from their summer break next week but he has been informed he is free to find another club.