Amauri is in a race against time to prove his fitness ahead of Saturday’s Serie A game against leaders Milan.
The January signing from Juventus picked up an injury during the 2-1 loss to Chievo Verona last weekend.
The Viola medical staff are attempting to get the Brazilian-born Italian international back at the disposal of boss Delio Rossi.
The latter will also probably be without the trio of Alessio Cerci, Riccardo Montolivo and Alessandro Gamberini for the trip to San Siro.
Amauri, 31, has yet to score in 10 League appearances since he was brought in by sporting director Pantaleo Corvino at the start of 2012.
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