Robertson was heavily linked with a Dons return during Stephen Glass’ time in charge but opted to join Portsmouth after leaving Rotherham two years ago.
Clark Robertson will have opportunities after leaving Portsmouth
The former Dons defender worked with Derby manager Paul Warne during his time in charge of Rotherham.
Derby finished seventh in English League One, missing out on the promotion play-offs by a point.
Meanwhile, Aberdeen are reportedly facing competition from Burton Albion, Lincoln City and Port Vale if they decide to step up their interest in defender Josh Dacres-Cogley.
The Tranmere full-back, 27, is out of contract and was a key target for former Dons boss Jim Goodwin.
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Former Aberdeen defender Clark Robertson to leave Portsmouth
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