Dowling, who has been in impressive form in recent weeks, was stretchered off in the 76th minute of the game at Musgrave Park, with a left knee injury and it transpires that he suffered medial ligament damage.
It means he will miss the Heineken Cup games against Clermont Auvergne and London Wasps and the Magners League trip to Edinburgh.
Guinness PRO12
Suite 208, Alexandra House,
The Sweepstakes
Ballsbridge, Dublin 4, Ireland
63x46.png){kind=logo}