Black Cats secure their second signing of the summer as the former Manchester United striker joins the club and is expected to make his debut against Arsenal on Saturday.
The 34-year-old becomes the Black Cats second signing of the summer following Carlos Cuellar's move from Aston Villa.
Saha joined his teammates in training on Thursday and is expected to make his debut in his side's Premier League opener against Arsenal on Saturday.
Sunderland boss Martin O'Neill is delighted to have signed the former Manchester United striker and feels he will bring a wealth of experience to the club.
"Louis is a striker whose abilities have been proven at the very highest level and he brings with him a raft of experience of top-flight football," O'Neill told the club's official website. "I'm sure he will be a great addition to our squad in an area we recognize needs strengthening and I'm delighted we have been able to complete the deal ahead of our first game of the season."
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