Manchester City are interested in signing Real Sociedad defender Inigo Martinez.
Sky Sports News understands that the Premier League leaders are actively trying to sign a new centre-back in January and Martinez is one of their options.
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City also remain keen on West Brom's Jonny Evans, who was a target for them in the summer.
Albion boss Alan Pardew said at the weekend that they would wait to see if a club made a bid for Evans before deciding on his future.
But Pardew, whose team are in the bottom-three and four points adrift of safety, has also admitted he is planning for a potential replacement.
City's other target Martinez is a 26-year-old Spain international with four caps. He is left footed and has played once at left-back for the Liga club this term.