Crystal Palace have made a new bid of £4.5m for Swansea City left-back Neil Taylor.
Palace's initial offer of £3m was rejected by the Swans, who have approached Norwich about the availability of defender Martin Olsson.
Taylor is currently first choice at Liberty Stadium following Ben Davies' move to Tottenham in July 2014.
West Brom are also interested in signing Taylor, who has made 23 appearances for the Swans this season.
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.
Tottenham's Kyle Naughton is among those who have been linked with the Swans, who have money to spend following Wilfried Bony's move to Manchester City, which could be worth up to £28m.