The head of world football's governing body has in the past been resistant to the idea of introducing any such computerised systems to the game.
But after an effort from Ukraine's Marko Devic clearly crossed the goalline against England on Tuesday night but was not spotted by officials, Blatter accepts there is no debate.
Even an additional referee on the byline failed to spot Devic's shot should have been ruled as a goal, which left Ukraine manager Oleg Blokhin irate.
And Blatter has now said on his official Twitter account: "After last night's match #GLT (goalline technology) is no longer an alternative but a necessity."
The demand from England for goalline technology reached fever pitch in the summer of 2010 when Frank Lampard