Tunisia won at the World Cup for the first time since 1978, beating Panama 2-1 in their final World Cup Group G match on Thursday.
The Tunisian captain's goal mobilised the French into action, with Deschamps bringing in stars like Kylian Mbappe and Antoine Griezmann to jump-start an attack that had so far been tepid.
Manchester United manager Louis van Gaal admitted it would be very hard to finish in the top four after his team's insipid 2-1 loss at Sunderland in the Premier League on Saturday.
IMAGES from the FIFA World Cup Group D game played between Australia and Tunisia on Saturday.
"It wasn't easy to collect these four points, only one of the games we played was not on the expected level and that was when we played versus Australia."
Two goals each for Romelu Lukaku and Eden Hazard and one for Michy Batshuayi swept Belgium to a 5-2 victory over Tunisia on Saturday that put them in command of World Cup Group G.
David de Gea's late own goal earned Sunderland a 2-1 win over Manchester United on Saturday and a vital three points in their bid for Premier League survival.