De Boer will be at the helm until the 2022 World Cup
Frank de Boer has been appointed as the Netherlands' new coach, the Dutch Football Federation (KNVB) announced Wednesday.
"The 50-year old former international will be at the helm of the Oranje until the World Cup in 2022," the KNVB said in a statement.
He would replace Koeman who left last month to become Barcelona coach.
"Together with the prime minister, it is the most important job in the Netherlands, everyone is talking about it," said De Boer on Dutch television last week when he was asked whether he would be interested in the job.
The subject of Koeman's replacement has dominated Dutch sports programs in recent weeks with pundits offering their own insider versions of the selection process.
It has included the KNVB contacting both Frank Rijkaard and Bayer Leverkusen coach Peter Bosz first as potential candidates before entering into talks with De Boer.
Dutch captain Virgil van Dijk told reporters after their Nations League matches this month that the players had given a list of their preferences to the KNVB.
Louis van Gaal, who has twice previously coached the national team, left the door open to a possible return when questioned on TV but the prospect was vetoed by the players, reports added.
The 50-year-old De Boer taking the job has elicited a mixed response, acknowledging his success in winning four successive Dutch league titles with Ajax Amsterdam but also highlighting failures at Inter Milan and Crystal Palace.
De Boer, who won 112 caps and played at two World Cups for the Netherlands, was last at Atlanta United in Major League Soccer but left in July after 18 months in charge.
He would be thrust quickly into the new job with a friendly against Mexico in Amsterdam on Oct. 7 before Nations League matches away against Bosnia on Oct. 11 and Italy on Oct. 14.