Hull hope to find out the exact extent of the injury today but may have to wait until the middle of the week.
Bullard's woes with his right knee had already caused him to miss more than nine months before his return on October 19.
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On Saturday at Aston Villa, he looked in agony before being carriedoff crying after he landed awkwardly following an aerial challenge withJames Milner.
Hull's George Boateng missed much of last season with a knee ligament injury so he sympathises.
Boateng said: 'We mustn't be too negative. Maybe he'll be back in afew days. When you've been out for a long time and come back, everyniggle can feel like the end of the world.'
Hull boss Phil Brown said: 'Hopefully we can have good news on Monday. The lad lives and breathes football. It's his life.'
Explore more:People:Phil Brown, Jimmy Bullard, James Milner, George Boateng