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The France striker, who had completed his medical earlier on Tuesday morning, signed a five-year contract and was handed a No. 9 shirt by club president Florentino Perez.
France won 1-0 with Muani's late strike deflected in off Jan Vertonghen in the Belgian defence.
Austria won 3-2 against Holland while Lewandowski's equaliser made it 1-1 for Poland against France in Group D.
Mbappe tried on the specially made mask on Thursday.
French Football Federation confirmed Mbappe had broken nose and would have a mask made.
Usual questions about the challenge Austria might pose in the Group D clash in Duesseldorf were relegated at the pre-match media conference with Mbappe speaking openly about his fears.
The 25-year-old striker has signed for the Spanish giants on a five-year contract.
There has been widespread media speculation that Mbappe will move to Real Madrid. Mbappe did not mention the Spanish champions in his video but confirmed he would leave France.
PSG will face Borussia Dortmund in the semifinals after the Germans beat Atletico Madrid.
Paris St Germain's Kylian Mbappe scored twice to lead them into the Champions League quarterfinals.