He had his contract with Australian Rugby Union cancelled in July, although the details were not revealed for legal reasons.
However Tuqiri is eager to put his recent troubles behind him and is relishing the new challenge in England.
"I live for the big stage and Leicester are a big club," the former New South Wales Waratahs man added. "At this time in my career, I want to be in a competitive team and Leicester is that.
"Leicester as a club has to take a pat on the back, they have a real good name internationally.
"They have a great following and I experienced that the other night against Northampton.
"I walked around the stadium and got some funny looks from fans thinking is it or isn't it, but a few thought it was me and said good luck and welcome. The fans have been great so far."
The game, which is South Africa's first match of their autumn tour, kicks off at 1930 GMT.
You can hear full match commentary of Leicester Tigers v South Africa on BBC Radio Leicester 104.9FM, DAB and online at bbc.co.uk/leicester
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