Curtis Main has become the third player to join Aberdeen in the last 24 hours after signing a two-year deal.
The 26 year old joins from Motherwell, having spent the last 18 months with the Fir Park side.
Main is a former team-mate of Dons coach Barry Robson, having played with the midfielder when they duo were at Middlesbrough.
Main said: “I’m excited by the challenge and by the different aspect of playing for Aberdeen. Obviously European football is a big draw and it’s a big club, one that I am excited to join. So now I am here I am looking forward to getting started.
“I’ve enjoyed playing in the league and I’m pleased to move on to such a good club like Aberdeen. I just hope I can bring success to the club.”
Main follows Ryan Hedges and Ashton Taylor in moving to Pittodrie this summer.