Sky Sports understands West Ham are eyeing a move for Shakhtar Donetsk left-back Razvan Rat.
Rat is out of contract in the summer and with the 31-year-old unlikely to agree a new deal at Shakhtar, the Ukrainian club are keen to secure a fee in January.
The Hammers have already brought in Emmanuel Pogatetz on loan until the end of the season and the Austrian is capable of operating at left-back.
But Sam Allardyce could still be forced into a cut-price offer with several other Premier League clubs tracking the player this week.
The Romania international has vast experience having won league titles in his homeland as well as with Shakhtar and was part of the team that won the UEFA Cup in 2009.