The Brazilian opened the scoring at Cagliari's Stadio Is Arenas stadium after just six minutes and had his second in the 21st
A penalty from Emmanuel Cascione reduced arrears before the break but just after the hour Thiago completed his hat-trick before Mauricio Pinilla clinched the victory in the 77th minute.
Vladimir Weiss grabbed a consolation before the end but it was the Sardinians who would move on.
Cagliari's reward for their victory is a last 16 tie against Juventus.
- Sports & Recreation
- Emmanuel Cascione
- Mauricio Pinilla