Ash Taylor has returned to Aberdeen on a two-year deal.
The 28-year-old, who left the Dons two years ago to join Northampton Town, made 126 appearances during his first spell with the Reds.
The central defender made his final appearance for the Dons in the 2017 Scottish Cup final.
He returns to Aberdeen after making 87 appearances for the Cobblers.
Aberdeen earlier in the day announced the signing of Barnsley’s Ryan Hedges on a three-year deal.
The Wales international, 23, has signed a pre-contract agreement and will join the Dons on July 1.