O'Connell's World Cup is over
O'Connell was forced off with a serious injury during Sunday's 24-9 final Group D victory over France in Cardiff.
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Laporte told French radio RMC that the 108-times capped O'Connell had suffered a torn hamstring muscle.
The injury could signal the end of the Irish career for lock O'Connell, 35, who is leaving international rugby and joining Toulon after the World Cup.
Ireland flank Peter O'Mahony has already been ruled out after suffering knee ligament damage in their brutal victory over France.
And doubts over O'Connell and star flyhalf Jonny Sexton hang over Ireland as they countdown to a quarterfinal against Argentina on Sunday.
Agence France-Presse
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