The Fulham keeper was named on Monday as an understudy to Joe Hart but told Capello he is due to tie the knot with fiancee Katie the day before the Euro 2012 qualifier at Wembley on June 4.
Date game: David Stockdale is gettingmarried a day before England's game with the Swiss
Sportsmail understands the 25-year-old was willing to link up with Capello's squad after his special day or even change the date.
However, England decided it made little sense to ask him to abandon his new wife and return to the fold when he would have been sitting in the stands, in all likelihood, as third choice behind Hart and West Bromwich Albion's Scott Carson.
Instead, England's goalkeeping complement will be brought up to strength by Green, who has spent the last two months weighing up whether to continue his international career.
The West Ham No 1 has not played for Capello since his gaffe in England's opening World Cup draw against the United States last summer, when he allowed Clint Dempsey's long-range shot to squirm under his body.
Green, 31, was unhappy at being overlooked for a run-out in March's friendly against Ghana a game in which the manager made wholesale changes.
Capello and assistant Franco Baldini are understood to be trying to persuade him not to announce his international retirement.
England contacted Green over the weekend seeking clarification about his plans and the goalkeeper, who became a father last week, said he would get back to them after speaking to his family.
But there was no further contact between the two parties before Capello named his 23-man squad for the Switzerland game, as England decided Green would benefit from the break after becoming a dad and following West Ham's relegation.
Forgotten man: Robert Green has not appeared for England since his infamous gaffe in Rustenberg
That plan quickly changed when Stockdale, who was an unused substitute during the 2-1 victory in Denmark in February, contacted England to inform them of his impending nuptials.
Birmingham goalkeeper Ben Foster, another to be relegated from the top flight this season, decided this month to take a sabbatical from international football, citing a succession of nagging injuries as the reason why he put club before country.
Capello will be concerned at the lack of options he has in the event of Hart getting injured.
The one and only: England will have serious concerns should Joe Hart suffer injury
Leeds-born Stockdale's first team chances at Fulham have been limited by Mark Schwarzer and doubts surround Carson's future at the Hawthorns after manager Roy Hodgson looked to tempt Brad Friedel into a move.
Friedel, 40, is out of contract at Aston Villa and Liverpool are favourites to head off interest from Tottenham and take him back to Anfield.
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Explore more:People: Robert Green, Joe Hart, Fabio Capello, Roy Hodgson, Ben Foster Places: Leeds, Birmingham, Liverpool, Denmark, United Kingdom, Ghana, Switzerland