Clayton has made just one appearance since mid-October after falling out of favour under former boss Garry Monk
And he is yet to feature since Tony Pulis took charge on Boxing Day.
Manchester City academy graduate Clayton has made 150 appearances for Middlesbrough since joining from Huddersfield in 2014.
GETTY
Adam Clayton spent two seasons with Leeds between 2010 and 2012
BETVICTOR
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BetVictor believe a number of clubs could be in the race for his signature.