O'Connor laid low by mystery illness
The versatile back, who mostly plays at full-back or wing for the European champions, was taken to hospital after coming down with the illness last weekend following Toulon's 43-13 win at Oyonnax.
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According some reports O'Connor suffered a heart attack during the trip home
The 25-year-old underwent tests, the results of which proved "reassuring and satisfying" according to Toulon, allowing him to leave hospital.
The club's medical staff will continue to monitor O'Connor and do more tests to try to discover the nature of his problem.
He is currently out of reckoning for club action but Toulon said that his career was not at risk.
Agence France-Presse