The Blackhawks said Hossa has an upper-body injury, and the Sharks did not specify why Ward is out.
Hossa, who turns 37 on Jan. 12, played 23 shifts and 16:50 in a 3-2 shootout win Saturday in Buffalo, including two shifts in overtime. He has five goals and 11 assists in 31 games.
Ward was scratched after he was on the receiving end of a boarding penalty by Ottawa defenseman Mark Borowiecki in the final seconds of the Sharks' 4-2 loss on Friday night. Ward played in San Jose's first 32 games and has 10 goals and 13 assists.