It was the substitutes who came to Spain's rescue against Tunisia on Monday, Raul scoring the equaliser and Cesc Fabregas and Joaquin helping tease open the defence.

Their performances showed how little there is to choose between the players and a strong performance could be rewarded with a place in the starting lineup.

“Everyone wants to play,” Joaquin said on Wednesday. “Even though we have already qualified it is still a World Cup match and I'm determined to make the most of the opportunity.”

Leading striker Fernando Torres will be rested, while Raul and David Villa are likely to play 45 minutes each up front.

Santiago Canizares will stand in for Iker Casillas in goal and Aragones will also field a new-look back four.

Victory against the Saudis would mean Spain qualify with a 100 percent record in the group for the second time in a row and further strengthen their belief that this is their year.

“If we win our last game and finish on nine points then people will realise we mean business,” said Fernando Torres.

Saudi Arabia coach Marcos Paqueta knows that anything other than an unlikely victory over Spain could spell the end of his short stint in charge of the national team.

The Brazilian was only recruited in December to replace Argentine Gabriel Calderon, who had guided the Sons of the Desert through the qualifying campaign in style.

Paqueta has vowed to fight on but will need an extraordinary improvement after his team imploded in a 4-0 loss to Ukraine, having thrown away victory against Tunisia in their opener.

He is unlikely to make sweeping changes, although needing a victory to have a chance of reaching the last 16 for the first time since 1994, he could start with veteran skipper Sami Al Jaber supporting Yassir Al Qahtani up front.

“We knew we had two difficult games against Ukraine and Spain, but in life you have to have hope in everything and be positive right to the end,” said Paqueta.

“The most important thing is that the players showed they were committed and eliminated the image of the last World Cup participation.”

Saudi Arabia famously suffered an 8-0 defeat by Germany in their first match of the tournament four years ago.

Probable teams:

SAUDI ARABIA (4-5-1): 1-Mohamed Al Deayea; 2-Ahmed Dokhi, 13-Hussein Sulaimani, 4-Hamad Al Montashari, 3-Redha Tuker; 14-Saud Al Khariri, 6-Omar Al Ghamdi, 8-Mohamed Noor, 9-Sami Al Jaber, 16-Khaled Al Thaker; 20-Yassir Al Qahtani.

Coach: Marcos Paqueta.

SPAIN (4-3-3): 19-Santiago Canizares; 2-Michel Salgado, 20-Juanito, 4-Carlos Marchena, 12-Antonio Lopez; 6-David Albelda, 13-Andres Iniesta, 18-Cesc Fabregas; 17-Joaquin, 10-Jose Antonio Reyes, 7-Raul.

Coach: Luis Aragones.

Referee: Coffi Codjia (Benin).—Reuters