The two stars will be in Sony Six studio for the FIFA World Cup pre-game show, Cafe Rio.
Varun says now that the movie promotions are coming to an end, he does not miss as many matches and despite being a fan of Argentina's Lionel Messi, his loyalties are with Brazil.
"I did miss a few matches initially but every time Brazil has played I have watched it. I also tuned in for Argentina and Colombia matches as I am supporting the South American teams this year," Varun told PTI.
"When they approached again, I asked Alia and she was game for it as Germany's match is on the same day and she is a German fan. This fitted in nicely. It was cool to be on the show," he added.
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Alia, on her part, says if not Germany she would support Brazil as she has a huge crush on the goalkeeper Julio Cesar.
When asked whether they fought over their favourite teams Alia said Varun teased her about supporting Germany.
"I don't fight with Varun for Brazil but if there is a match of Germany then there are arguments all the way," she said.
'Humpty Sharma Ki Dulhania', their next film after 'Student of the Year', is releasing on July 11.