Egypt have not appeared at a World Cup since 1990 but Salah's 95th minute penalty against Congo sparked wild scenes of celebration at the final whistle as they booked a spot at Russian Federation.
Al-Sisi had special praise for match-winner Mohamed Salah, who scored a penalty in injury time to secure the qualification.
Millions of Egyptians took to the streets chanting slogans and waving the country's flag, after a 2-1 win against Congo on Sunday.
The Reds star scored a brace, including the victor in stoppage time, to help Egypt to a 2-1 victory over Congo, securing their first appearance in the World Cup since 1990.
The win sent hundreds of thousands of fans across Egypt celebrating, honking vehicle horns and waving the country's red, white and black flags. The other three African qualifiers will be decided in the final qualifying games next month.
The home fans were jubilant, knowing a World Cup ticket was theirs, but with two minutes to go Congo drew level - Arnold Bouka ghosting in at the far post to sweep home a volley past El Hadary. It won't be our last World Cup, it will become a habit for us to qualify afterwards.
The president announced the reward on Monday as he met the Argentine coach Hector Cuper and the players.
Egypt has won seven Africa Cup of Nations titles but has only qualified for the World Cup twice, first in 1934 and then 1990.
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