Not important if you give it straight back.
I don't think people doubt Sissoko's ability to carry the ball, when he wants to he's the best in the business at doing that. But I struggle to recall many excellent crosses, or piledrivers, or incisive passes when he gets into the final third. As has been said so many times on this board, he's an athlete - a damn impressive one too - but his footballing intelligence is really not that great.