A Paris prosecutor said on Wednesday former Societe Generale (SocGen) trader Jerome Kerviel should be sentenced to five years in jail for his role in France's biggest-ever rogue trading scandal.

Kerviel should be convicted of breach of trust and forgery which caused a loss of 4.9 billion euros (6.1 billion U.S. dollars) to his former employer French bank SocGen, the prosecutor said.

In 2010, the "rogue trader" was sentenced to five years in prison, including two suspended and was ordered to compensate the 4.9-billion-euro damage, including interest, to SocGen.

The 35-year-old trader who admitted his risky gamble appealed the court's ruling, insisting that his superiors knew what he was doing and encouraged him to take risks. But the allegations were rejected by SocGen.

"Your decision should set an example and be dissuasive, whether all those who see Kerviel as a victim of finance like it or not ... he is a victim only of himself," the prosecutor was quoted by local media as saying.

Paris appeal court, which will deliberate on its final judgment Thursday, will also rule on civil damages.

Between late 2007 and early 2008, Kerviel exceeded trading limits and logged false transactions to cover his gambles that finally left an irreversible 4.9-billion-euro loophole, bringing SocGen, one of the biggest European banks, to the brim of bankruptcy.