QPR have signed Yun Suk-Young for an undisclosed fee from Chunnam Dragons and will press ahead in their attempts to buy Stoke striker Peter Crouch.
South Korea defender Yun, 22, has signed a three-and-a-half year deal and is now awaiting a work permit.
Stoke are willing to sell Crouch but have rejected an offer of cash plus Hoops striker Jamie Mackie.
Meanwhile, midfielder Alejandro Faurlin has agreed to join Italian side Palermo on loan until the end of the season.
QPR boss Harry Redknapp has signed Crouch, 31, for both Tottenham and Portsmouth, but Stoke are hoping to recoup close to the £12m they paid for him in August 2011 before sanctioning a third link-up between the pair.
Redknapp also wants to sign former Blackburn defender Chris Samba from Anzhi Makhachkala before Thursday's deadline.
Redknapp has signed striker Loic Remy and defender Tal Ben Haim, but has also seen defender Anton Ferdinand and striker Djibril Cisse depart this month, and will lose Ryan Nelsen to Toronto FC before the transfer deadline.
Faurlin, 26, who joined the west London club from Instituto in a £3.5m deal in July 2009, is also set to depart.
He played a key part in the Hoops' promotion to the Premier League in 2011, although the club was only confirmed as Championship winners after escaping a points deduction following breaches of transfer regulations in the signing of the Argentine midfielder.
He made 15 appearances in all competitions this season, including a late substitute appearance in Tuesday's 0-0 draw against Manchester City.