The Spanish midfielder has joined the Championship outfit on a season-long loan deal from Spanish club Celta de Vigo.
The 27-year-old is looking forward to getting started for the Owls and is ready to work hard to be successful at Hillsborough.
Wednesday have been busy in the transfer window so far this summer, as they attempt to break into the top six of the Championship next season.
The Owls have signed as many as four players on a permanent deal - Darryl Lachman from FC Twente, Marco Matias from Nacional, and Lewis Price and Ross Wallace on free transfers.
Carlos Carvalhal’s side have signed three players on loan deals - Vincent Sasso from Braga, Jack Hunt from Crystal Palace and Lopez from Celta.