Gracia confirmed goalkeeper Heurelho Gomes (back) and defenders Craig Cathcart (knee) and Younes Kaboul (foot) were ruled out of the clash with injuries.
"They are not yet ready but I hope like the other players who are injured that they will be back soon. I think with the players we do have we can still do some good work," he said.
New signing Didier Ndong will be unavailable as the midfielder completes the final game of a three-match ban incurred at his former club Sunderland.
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Watford are 11th in the table with 27 points from 25 games with seven wins, six draws and 12 defeats.
(Reporting by Shrivathsa Sridhar in Bengaluru; editing by Amlan Chakraborty)
