The 26-year old is currently contracted to Servette in his homeland, but is being made available on a Free Transfer due to the fact that his club have been recently made bankrupt.
Euro 2004 star Roth will see the rest of the season out with French side Lorient in the meantime after signing for them on a short term contract last month.
Wanderers manager Sam Allardyce is looking for another goalkeeper amid speculation that Jussi Jaaskelainen will be prized away from the Reebok Stadium over the summer months.