Having earned a reputation this season as comeback kings, cemented in midweek with an extremely late win over Celtic in the Champions League, the Catalans will be hoping for a more straight forward victory on Saturday evening and Bet365 price them at 1/4 (1.25) to claim three points.
Rayo meanwhile are available at 10/1 (11.00) to pull off an enormous shock, while the draw - which would be almost as surprising as a home win - is offered at 5/1 (6.00).
The side from the district of Vallecas look to have a real fight on their hands to stay in the division this season, having narrowly avoided relegation in the dying seconds of the previous campaign.
Rayo's main problem seems to be in defence where they have failed to keep a clean sheet in any of their last five matches conceding 16 goals in the process.
Indeed Rayo have leaked the second highest number of goals in the Spanish top flight, meaning that Tito Vilanova's side will fancy their chances of finding the back of the net several times.
Therefore the price of 4/7 (1.57) for the Catalans to score in both halves looks just about big enough to invest in given the paucity of quality in the home defence and the proficiency in front of goal boasted by the visitors.
For a value bet boasting bigger odds, try backing over 2.5 goals in the first half at 10/3 (4.33) which looks like offering the potential of some excellent profit.
If Rayo defend as they have been in recent weeks they will be torn apart by a Barca side who are more than capable of netting three times in 45 minutes as they proved last week when they got four in the first half at Deportivo La Coruna.
|Barca to score in both halves at 4/7 (1.57) with Bet365
||Over 2.5 goals first half at 10/3 (4.33) with Bet365|
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Phil Kitromilides is a sports broadcaster working on radio and TV in London and Madrid. You can also follow Phil on Twitter.