Williams said: "I'm so happy and excited to be going back to Russian Federation for such a unique performance".
"Please understand that the track list for the opening ceremony of the 2018 Fifa World Cup has been agreed between the artists, Fifa, and the local organising committee, who would like to keep this as a surprise for the public until the show".
The Opening Ceremony will be produced by Russia's Channel One and the "creative concept" will be developed by Felix Mikhailov, who has directed other World Cup events including the preliminary and main draw.
Russian soprano Aida Garifullina will also entertain the crowd in Moscow's Luzhniki Stadium on Thursday.
The underlying theme of celebrating not only football but also the host country will be represented by a performance from Garifullina.
"The opening match is always a very symbolic one - it is that instant when you realise that the big moment you, as a player or fan, have been waiting for for four years has finally arrived", he said.
Wearing a bright yellow two-piece suit and carrying a World Cup trophy, Mohamed spent Tuesday visiting close to two dozen businesses in Edmonton to offer up metres and metres of national flag-emblazoned bunting and sharing his love of the sport.
Trump also assured that the USA would hold the tournament "in a similarly open and festive manner" as the 1996 and 2002 Olympic Games that the USA hosted, the Times reported.
Host nation Russian Federation kicks off the tournament Thursday morning when it takes on Saudi Arabia in Moscow at 9 a.m.