Swansea City have enquired about the availability of Norwich City left-back Martin Olsson, BBC Wales Sport understands.
Sweden defender Olsson, 26, joined Norwich from Blackburn Rovers in 2013.
He has made 22 appearances for the Canaries this season and has started three of Sweden's Euro 2016 qualifiers.
Swansea's current left-back Neil Taylor, the subject of a £3m bid from Crystal Palace, is also understood to be of interest to West Bromwich Albion.
There has been no bid yet and Taylor is not thought to be interested in a move away from the Liberty Stadium.
The Wales international, who has made 23 appearances for Swansea this season, is currently first choice following Ben Davies' move to Tottenham in July 2014.
The 25-year-old joined Swansea from Wrexham in 2010 and was a target for Fulham and West Ham last season.
Swansea manager Garry Monk is eager to add to his squad during the January transfer window, and signing a full-back is one of his priorities.
The club has money to spend following top-scorer Wilfried Bony's move to Manchester City, which could be worth up to £28m.