The Frenchman will assist head coach Roberto Martinez alongside Graeme Jones, who was Martinez’s assistant at Swansea, Wigan and Everton.
“Honoured to be assistant coach for Belgium. Thanks to Roberto Martinez and the Royal Belgian FA. Very excited. Can’t wait,” Henry said social media.
The announcement came as the former Everton manager named his first senior squad since taking the taking over from Marc Wilmots as Belgium boss.
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Martinez said: “Thierry is an important figure. He will bring something different. He agreed right away to join us.
“He is someone who knows how to develop a collective mentality, how to work together to win. He won the World Cup in 1998 and has the experience to achieve great things.”
Since hanging up his boots, Henry has worked as a pundit for Sky Sports and also as coach of the Arsenal U18 side.