Aberdeen have announced the signing of Dominic Ball from Rotherham United on a season-long loan deal.

Ball returns to Pittodrie for a second spell, having been on loan at the Dons last season.

The defender played 16 times, becoming a regular pick by the latter stage of the season and playing every post-split match as Derek McInnes' side closed the season with an unbeaten run.

"I'm delighted to welcome Dom back," McInnes told Aberdeen's official website.

"He showed exactly what he is capable of in the latter part of the league campaign when he played a vital role in our post-split games during which we were undefeated."

Ball becomes Aberdeen's fourth signing of the summer, following Lewis Ferguson, Chris Forrester and Stephen Gleeson in joining the Dons.