Trezeguet's real name is Mahmoud Hassan, but is known by the nickname after a coach from early in his career believed his looks and style recalled the former French international, David Trezeguet.
The 24-year-old winger had been attracting attention from Italian side Sampdoria after an impressive showing in the African Cup of Nations this summer.
Trezeguet will become the latesst Villa signing in a summer of heavy recruitment as the side prepare for their return to the top light.
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Dean Smith's side have also signed Tyrone Mings, Wesley Moraes, Matt Targett, Ezri Konsa, Jota, Anwar El Ghazi and Kortney Hause, with Axel Tuanzebe a possible arrival from Manchester United.
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