The Polish gloveman was alleged to have hurled the bottle at Saints supporters following the loss to Tottenham on October 28 and was subsequently dropped for Paulo Gazzaniga for Monday's defeat at West Bromwich Albion.
However, an investigation suggests Boruc was not at fault and he is now eligible for the weekend's home fixture with Swansea City.
"The investigation has now been concluded to the satisfaction of the football club. Artur is now back in contention for the remaining fixtures," said manager Nigel Adkins.
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