Capello thinks Rooney is ready for tomorrow's match after talking with the Manchester United forward.
"(Rooney) told me he is ready to play and he wants to play," said Capello, who refused to reveal details of the conversation. "In training he was very good. It's good for us and the England team.
"We're focused on the game and not the private life of the players."
Two Sunday tabloids have alleged that Rooney cheated repeatedly on his then-pregnant wife last year with a prostitute.
Rooney flew to Basel with the England squad on Monday following speculation he could miss the match to be with his family.
Capello said he looked for Rooney to repeat his good form of last Friday, when he helped create all England's goals in a 4-0 victory over Bulgaria to begin Euro 2012 qualifying.
"He will also be in a good situation tomorrow, I hope," said the Italian coach, who will make one change in his lineup after defender Michael Dawson hurt his left knee and ankle against Bulgaria.
Capello dismissed suggestions that Rooney was receiving different treatment to John Terry, who was stripped of the England captaincy this year following tabloid revelations about his private life.
"(Terry) was captain. But I never punished him (because) he played all the games," Capello said.
Switzerland coach Ottmar Hitzfeld suggested Monday that personal problems "will weigh" on Rooney, but that he should be selected.
"I expect Capello will let Wayne Rooney play because he's in great condition at the moment and a coach isn't going to pass on a player of his caliber," Hitzfeld said at a news conference. "If you give England room then they're extremely dangerous. I think they've learned from their mistakes during the World Cup when they suffered counterattacks."
Hitzfeld has his own on-field issues with a Swiss team that has struggled to score and failed to win at home in six games, including a 0-0 draw with Australia in a friendly last Friday.
"Total attacking to end the goal drought wouldn't be the right thing," said the veteran German coach at the Swiss team hotel at Feusisberg.
No Switzerland striker has scored in 11 games, since last Sept. 9 when Alex Frei and Eren Derdiyok found the net in a 2-2 draw in a World Cup qualifier in Latvia.
Switzerland's only goal in South Africa - where it failed to progress from its group - came from midfielder Gelson Fernandes in an upset 1-0 win over eventual champion Spain.
"We always go into a game to win," Hitzfeld said. "We have to find the right mix between the Spain game, when we defended very well, and switching swiftly into offense."
Frei, the Switzerland captain who was jeered by home fans after missing a penalty against Australia, is set to face England counterpart Steven Gerrard on the field for the first time since a controversial incident in a group match at Euro 2004.
Frei was caught on camera spitting at Gerrard during England's 3-0 win in Coimbra, Portugal, and later suspended for three matches by UEFA, which used video evidence after it was not spotted by the match referee.
Switzerland goalkeeper Diego Benaglio is scheduled to play, but Hitzfeld has given permission for him to join his wife in Germany if she goes into labour with the couple's first child, which is due to be born Wednesday.
