Hospital bosses say the majority of computer systems affected by a cyber attack that led to the cancellation of routine operations and outpatient appointments have been restored.
Hundreds of people were affected by the attack on Northern Lincolnshire and Goole (NLAG) NHS Foundation Trust and United Lincolnshire Hospitals Trust.
At least 35 operations had to be cancelled as a result.
In a statement the Trust said most of its systems were now working.
The announcement, posted on the Trust's website, said: "The majority of our electronic systems are now back up and are working.
"We are hoping it will be business as normal tomorrow [Thursday] but please visit the website after 17:00 GMT today to check to ensure we have not had to make further cancellations."
NLAG runs hospitals in Goole, Grimsby and Scunthorpe, and its computer system is linked to that at United Lincolnshire Hospitals Trust (ULHT).
The trust's deputy chief executive Karen Dunderdale said the attack took place on Sunday.