His agent, Scott Fisher, revealed: "I'm sure Celtic would appeal to most players, as would Champions League football.
"But there has been no contact from Celtic and, at the moment, Steven is a Sunderland player with two-and-a-half years left on his contract. So, until they decide if they are selling the player, it is between the two clubs to sort out.
"I am sure there is also interest from English Premier League clubs in a player of his quality."
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