O'Toole will immediately return to Canada and will seek a club in his home country in order to further his chances of selection for his national team's November tour of Europe.
Head coach Sean Lineen said, "Chauncey joined us on a trial basis during pre-season and returned to Canada before agreeing to come back on a very short-term deal to provide cover at a time when we had an unprecedented number of injuries.
"He made a positive contribution to the Warriors and continued to develop as a player during his time here and we wish him the very best of luck as he seeks to further his international career back in Canada."
The 24-year-old has won six caps for Canada since his Test debut against Ireland in 2009.
He took part in the Churchill Cup over the summer where he was named Man of the Match in Canada's 48-6 victory over Uruguay and scored a try in the final against England Saxons. He has also represented Canada 7s on the IRB Sevens World Series circuit.
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