MADRID - Spain coach Vicente del Bosque said he planned to make some changes to his starting lineup for the European champions' 2010 World Cup qualifier against Turkey in Istanbul on Wednesday. Del Bosque started with strikers Fernando Torres and David Villa in Saturday's 1-0 victory against the Turks in Madrid but said he was considering using only one front man on Wednesday operating in front of a five-man midfield. "There will be some changes to freshen things up," the former Real Madrid coach told a news conference in Istanbul, extracts from which were published on the Spanish soccer federation website. Midfielders Albert Riera and David Silva could start, he added. The pair would likely occupy the wide spots in a five-strong midfield with Xavi playing just in front of Marcos Senna and Xabi Alonso in the centre. Spain, who top the world rankings, lead qualifying Group Five with a maximum 15 points from five matches ahead of Bosnia on nine and Turkey with eight. If Spain win on Wednesday they would be almost certain of a place in South Africa next year. Bosnia host fourth-placed Belgium and Armenia play in Estonia in the other matches in the group. Del Bosque said defenders Carlos Marchena and Alvaro Arbeloa could also be in the starting lineup after they watched Saturday's match from the bench. "We can relax with this team as it has always responded to the biggest challenges," he said.