The Blues have hithero failed to impress in their warm-up matches, losing 3-0 to Werder Bremen and having to come from behind to beat Hungarians Ferencvaros in thier most recent friendly.
They will, therefore, be looking to build some momentum heading into the season opener and bet365 price Jose Mourinho's side at just 2/5 (1.40) to overcome the side from San Sebastian.
La Real are offered at 7/1 (8.00), while the draw can be backed at 7/2 (4.50).
The Basques have already been in competitive action this season, overcoming Aberdeen 5-3 on aggregate in their Europa League qualifier, and they are known for being a side that scores plenty of goals.
The loss of France international Antoine Griezmann - who has moved to La Liga champions Atletico Madrid over the summer - will be keenly felt but Sociedad will still be capable of getting on the scoresheet - as they have managed to do in six of the seven matches they have played this summer.
The fact that La Real have already been in competitive action should mean they come into this game more perpared than some of Chelsea's other pre-season opposition.
Punters can almost always feel confident of backing Chelsea to score at home, especially with the additions of Diego Costa and Cesc Fabregas, making the price of 10/11 (1.91) for both teams to score look generous. Indeed, bet365 are top priced in this market and this looks like a selection well worth taking for Tuesday evening's clash.
|Both teams to score at 10/11 (1.91) for a 2.5pt stake with bet365