The 34-year old Brazilian goalkeeper was on loan with the MLS outfit from February but only remained at BMO Field until June because of World Cup duties.
Toronto have confirmed that Cesar has now officially finished his stint in North America and will head back to west London ahead of the 2014/15 Premier League season.
"At Toronto FC we aspire to be internationally recognized as a leader in every aspect that involves our football club, and to be a consistent contender for championships in North America," TFC general manager Tim Bezbatchenko said in a statement.
"With this ambitious vision comes the need for acquiring players of great character that leave an impact both on and off the pitch. Júlio César is certainly one of those players.
"On behalf of everyone at Toronto FC, I'd like to send our sincere thanks to QPR for the opportunity to bring Júlio to Toronto. We'd also like to thank Júlio for everything he brought to our club. He made an immediate impact and all of us are better for it."
Cesar, who started all of Brazil's five games at the 2014 World Cup, made a total of six appearances for Toronto during his time at the Canadian club.
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