More cuts are needed to avoid financial problems at Huddersfield and Calderdale hospitals.
Interim Operations Director, Mags Barnaby, said managers had put their thinking caps on to try and meet the £20m savings required by next March.
About £13m savings have been identified so far and 66 “non critical” jobs will go over the next two years.
She said: “This is not a slash and burn agenda but given the size of the financial challenges we do need to work together to guarantee the quality of care.
“We’re very far short of £20m and we’ve got a lot of work to do.”
Only £7.7m of the £19m cuts needed in 2015/16 have been identified.
Mrs Barnaby said compulsory redundancies were the “last resort” and an idea to reduce doctors and nurses pay had been “parked”.
But a focus on improving sickness absence rates is being brought in.
“The unions welcome this,” she claimed.
“There’s a sense that we might be a little bit soft.
“But we are supportive of people who are genuinely ill.”
Meanwhile the scale of the mortgage on Calderdale Royal Hospital has been revealed for the first time as £10m per year until 2061 – a total of £600m.
The hospitals’ chief executive, Owen Williams, said the private finance investment (PFI) set up in 2001 could only be bought out in 2031 and they were unlikely to be able to afford it.