The Scottish defender has been sturdy during his time with Sunderland but with his recent injury-prone state, it could be said that letting the former-Newcastle player move on would be best for both club and player.
Meanwhile, Tony Capaldi is expected to complete a move to Sunderland this week after the Wearsiders agreed a fee with the Pilgrims - beating off competition from 5 other sides, including Wolves and Leicester.
