The Egypt national football team have emerged as the second African country to qualify for the Russian Federation 2018 World Cup.
Congo nearly ruined the party when Arnold Bouka volleyed home to peg back the hosts after Salah's second-half opener.
A scoreless first half raised the nerves in Alexandria but Salah's first of the night put one Egyptian foot in Russian Federation.
Salah broke the deadlock in the 63rd minute when he latched on to a through pass from midfielder Mohamed Elneny of Arsenal.
When Bouka thumped home an equaliser for the unfancied and winless Congo late on it became clear why Cuper had turned to medication.
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Egypt was arguably Africa's best team during the 1990s and 2000s, despite never making the World Cup.
The game looked to be headed for a draw when Egypt were awarded a penalty.
They had suffered repeated heart-break instead, with one of the most painful defeats coming in 2009 when losing a bitterly-contested play-off against Algeria.
Nigeria were the first African country to qualify for the tournament after they defeated Zambia on Saturday.
"It's been 28 years and we're finally going to enter the World Cup".