Aberdeen boss Derek McInnes has made Anthony O'Connor his latest signing after the 23-year-old left Burton Albion.
The former Republic of Ireland U21 internationalist can also count Blackburn Rovers and Plymouth Argyle among his former clubs.
McInnes told the Aberdeen website: "Anthony can play anywhere across the back four. He can also play as a screening midfielder and can give us a bit of presence in the middle of the park."
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