Defender Ward has missed the last six games with a calf injury while midfielder Lansbury has rejoined the Canaries on loan from Arsenal until the end of the season.
Midfielder Andrew Surman is back in training after a knee problem, but the trip to the capital comes too soon for him.
The Canaries can move second - and two points behind leaders QPR - if they emerge victorious at Palace, where they have lost nine and drawn three of their previous 12 visits.
Norwich are unbeaten in six Championship matches, but lost 2-1 to Palace at Carrow Road in October.
Source: PA
Source: PA