The Madrid-based side have defeated Malaga and Celta Vigo in their last two league matches and will be keen to add to their tally of 16 points from 11 matches with a victory in the Basque Country.
It will not be easy, though, as Real will be desperate for points given their less-than-impressive start to the season.
Philippe Montanier's side are currently 13th in the table, three points behind Rayo but just as many above the relegation zone.
La Real will also head into Monday's encounter on the back of a win, having got the better of high-flying Malaga 2-1 away from home last weekend.
There are no suspension worries for either side.
Real Sociedad: LDLLW
Rayo Vallecano: LLLWW
Possible starting lineups:
Real Sociedad: Zubikarai, C. Martinez, Gonzalez, I. Martinez, De La Bella, Pardo, Illarramendi, Prieto, Vela, Castro, Ifran
Rayo Vallecano: Cobeno, Tito, Labaka, Amat, Casado, Da Silva, Trashorras, Fuego, Piti, Dominguez, Leo
Sports Mole says: 2-2