Leganes suffered a losing streak of late, and conceded 5 goals by Barcelona. There are some problems in their defensive end.
So Leganes should not be overestimated in this game.
On the other hand, Real Sociedad won all of their last 3 games, with good form.
Moreover, the AH line is not in favor of Leganes.
So Real Sociedad are expected to keep unbeaten in this game.