His injury leaves manager David Moyes with Jermain Defoe as Sunderland's only fit recognised striker. The club are also without goalkeeper Vito Mannone, who is out for around three months with an elbow injury.
Borini joined Sunderland on a permanent deal in August last year and scored five league goals in 26 appearances as the club narrowly avoided relegation last season.
Sunderland will look for their first league win of the new campaign when they host Everton at the Stadium of Light on Sept. 12.
(Reporting by Ian Rodricks in Bengaluru; Editing by Toby Davis)
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